diff --git a/docs/相关性检索优化说明.md b/docs/相关性检索优化说明.md
index 1822573..b398c75 100644
--- a/docs/相关性检索优化说明.md
+++ b/docs/相关性检索优化说明.md
@@ -17,9 +17,9 @@
 查询链路（文本相关）：
 
 1. `QueryParser.parse()`  
-   负责产出解析事实：`query_normalized`、`rewritten_query`、`detected_language`、`translations`、`query_vector`、`query_tokens`、`contains_chinese`、`contains_english`。
+   负责产出解析事实：`query_normalized`、`rewritten_query`、`detected_language`、`translations`、`query_vector`、`query_tokens`。
 2. `Searcher.search()`  
-   负责读取租户 `index_languages`，并将其一方面传给 `QueryParser` 作为 `target_languages`，另一方面传给 `ESQueryBuilder` 作为字段展开约束。
+   负责读取租户 `index_languages`，并将其传给 `QueryParser` 作为 `target_languages`（控制翻译目标语种）；`ESQueryBuilder` 仅根据 `detected_language` 与各条译文构建子句字段，不再接收 `index_languages`。
 2. `ESQueryBuilder._build_advanced_text_query()`  
    基于 `rewritten_query + detected_language + translations + index_languages` 构建 `base_query` 与 `base_query_trans_*`；并按语言动态拼接 `title/brief/description/vendor/category_*` 的 `.{lang}` 字段，叠加 shared 字段（`tags`、`option*_values`）。
 3. `build_query()`  
@@ -76,9 +76,6 @@
 
 最终按 `bool.should` 组合，`minimum_should_match: 1`。
 
-> **附 — 混写辅助召回**  
-> 当中英（或多脚本）混写时，为略抬召回：`QueryParser` 用 `contains_chinese`（文中有汉字）、`contains_english`（分词中有长度 ≥3 的纯英文 token）打标；`ESQueryBuilder` 在某一语言的 `multi_match` 上，按规则把**另一语种**的同类字段并入同一 `fields`（受 `index_languages` 限制），并入列的 boost 为配置值再乘 **`mixed_script_merged_field_boost_scale`（默认 0.6，`ESQueryBuilder` 构造参数）**。字段在内部以 `(path, boost)` 列表合并后再格式化为 ES 字符串。
-
 ## 5. 关键配置项（文本策略）
 
 `query_config` 下与解析等待相关的项：
@@ -147,11 +144,9 @@
   - `translations`
   - `query_vector`
   - `query_tokens`
-  - `contains_chinese` / `contains_english`
 - `Searcher` 负责“租户语境”：
   - `index_languages`
   - 将其传给 parser 作为 `target_languages`
-  - 将其传给 builder 作为字段展开约束
 - `ESQueryBuilder` 负责“表达式展开”：
   - 动态字段组装
   - 子句权重分配
diff --git a/query/query_parser.py b/query/query_parser.py
index 3ee2f85..655d827 100644
--- a/query/query_parser.py
+++ b/query/query_parser.py
@@ -50,8 +50,6 @@ class ParsedQuery:
     translations: Dict[str, str] = field(default_factory=dict)
     query_vector: Optional[np.ndarray] = None
     query_tokens: List[str] = field(default_factory=list)
-    contains_chinese: bool = False
-    contains_english: bool = False
 
     def to_dict(self) -> Dict[str, Any]:
         """Convert to dictionary representation."""
@@ -62,8 +60,6 @@ class ParsedQuery:
             "detected_language": self.detected_language,
             "translations": self.translations,
             "query_tokens": self.query_tokens,
-            "contains_chinese": self.contains_chinese,
-            "contains_english": self.contains_english,
         }
 
 
@@ -202,21 +198,6 @@ class QueryParser:
     def _get_query_tokens(self, query: str) -> List[str]:
         return self._extract_tokens(self._tokenizer(query))
 
-    @staticmethod
-    def _contains_cjk(text: str) -> bool:
-        """Whether query contains any CJK ideograph."""
-        return bool(re.search(r"[\u4e00-\u9fff]", text or ""))
-
-    @staticmethod
-    def _is_pure_english_word_token(token: str) -> bool:
-        """
-        A tokenizer token counts as English iff it is letters only (optional internal hyphens)
-        and length >= 3.
-        """
-        if not token or len(token) < 3:
-            return False
-        return bool(re.fullmatch(r"[A-Za-z]+(?:-[A-Za-z]+)*", token))
-
     def parse(
         self,
         query: str,
@@ -285,19 +266,12 @@ class QueryParser:
         log_info(f"Language detection | Detected language: {detected_lang}")
         if context:
             context.store_intermediate_result('detected_language', detected_lang)
-        # Stage 4: Query analysis (tokenization + script flags)
+        # Stage 4: Query analysis (tokenization)
         query_tokens = self._get_query_tokens(query_text)
-        contains_chinese = self._contains_cjk(query_text)
-        contains_english = any(self._is_pure_english_word_token(t) for t in query_tokens)
 
-        log_debug(
-            f"Query analysis | Query tokens: {query_tokens} | "
-            f"contains_chinese={contains_chinese} | contains_english={contains_english}"
-        )
+        log_debug(f"Query analysis | Query tokens: {query_tokens}")
         if context:
             context.store_intermediate_result('query_tokens', query_tokens)
-            context.store_intermediate_result('contains_chinese', contains_chinese)
-            context.store_intermediate_result('contains_english', contains_english)
 
         # Stage 5: Translation + embedding. Parser only coordinates async enrichment work; the
         # caller decides translation targets and later search-field planning.
@@ -459,8 +433,6 @@ class QueryParser:
             translations=translations,
             query_vector=query_vector,
             query_tokens=query_tokens,
-            contains_chinese=contains_chinese,
-            contains_english=contains_english,
         )
 
         if context and hasattr(context, 'logger'):
diff --git a/search/es_query_builder.py b/search/es_query_builder.py
index 32eb0d3..4b99a09 100644
--- a/search/es_query_builder.py
+++ b/search/es_query_builder.py
@@ -8,14 +8,11 @@ Simplified architecture:
 - function_score wrapper for boosting fields
 """
 
-from typing import Dict, Any, List, Optional, Union, Tuple
+from typing import Dict, Any, List, Optional, Tuple
 
 import numpy as np
 from config import FunctionScoreConfig
 
-# (Elasticsearch field path, boost before formatting as "path^boost")
-MatchFieldSpec = Tuple[str, float]
-
 
 class ESQueryBuilder:
     """Builds Elasticsearch DSL queries."""
@@ -39,7 +36,6 @@ class ESQueryBuilder:
         tie_breaker_base_query: float = 0.9,
         best_fields_boosts: Optional[Dict[str, float]] = None,
         best_fields_clause_boost: float = 2.0,
-        mixed_script_merged_field_boost_scale: float = 0.6,
         phrase_field_boosts: Optional[Dict[str, float]] = None,
         phrase_match_base_fields: Optional[Tuple[str, ...]] = None,
         phrase_match_slop: int = 0,
@@ -60,7 +56,6 @@ class ESQueryBuilder:
             function_score_config: Function score configuration
             default_language: Default language to use when detection fails or returns "unknown"
             knn_boost: Boost value for KNN (embedding recall)
-            mixed_script_merged_field_boost_scale: Multiply per-field ^boost for cross-script merged fields
         """
         self.match_fields = match_fields
         self.field_boosts = field_boosts or {}
@@ -77,7 +72,6 @@ class ESQueryBuilder:
         self.translation_minimum_should_match = translation_minimum_should_match
         self.translation_boost = float(translation_boost)
         self.tie_breaker_base_query = float(tie_breaker_base_query)
-        self.mixed_script_merged_field_boost_scale = float(mixed_script_merged_field_boost_scale)
         default_best_fields = {
             base: self._get_field_boost(base)
             for base in self.core_multilingual_fields
@@ -180,7 +174,6 @@ class ESQueryBuilder:
         knn_num_candidates: int = 200,
         min_score: Optional[float] = None,
         parsed_query: Optional[Any] = None,
-        index_languages: Optional[List[str]] = None,
     ) -> Dict[str, Any]:
         """
         Build complete ES query with post_filter support for multi-select faceting.
@@ -223,11 +216,7 @@ class ESQueryBuilder:
         # Text recall (always include if query_text exists)
         if query_text:
             # Unified text query strategy
-            text_query = self._build_advanced_text_query(
-                query_text,
-                parsed_query,
-                index_languages=index_languages,
-            )
+            text_query = self._build_advanced_text_query(query_text, parsed_query)
             recall_clauses.append(text_query)
         
         # Embedding recall (KNN - separate from query, handled below)
@@ -434,90 +423,36 @@ class ESQueryBuilder:
             return float(self.field_boosts[base_field])
         return 1.0
 
-    def _build_match_field_specs(
+    def _match_field_strings(
         self,
         language: str,
         *,
         multilingual_fields: Optional[List[str]] = None,
         shared_fields: Optional[List[str]] = None,
         boost_overrides: Optional[Dict[str, float]] = None,
-    ) -> List[MatchFieldSpec]:
-        """
-        Per-language match targets as (field_path, boost). Single source of truth before
-        formatting as Elasticsearch ``fields`` strings.
-        """
+    ) -> List[str]:
+        """Build ``multi_match`` / ``combined_fields`` field entries for one language code."""
         lang = (language or "").strip().lower()
-        specs: List[MatchFieldSpec] = []
-        text_fields = multilingual_fields if multilingual_fields is not None else self.multilingual_fields
+        text_bases = multilingual_fields if multilingual_fields is not None else self.multilingual_fields
         term_fields = shared_fields if shared_fields is not None else self.shared_fields
         overrides = boost_overrides or {}
-
-        for base in text_fields:
-            field = f"{base}.{lang}"
+        out: List[str] = []
+        for base in text_bases:
+            path = f"{base}.{lang}"
             boost = float(overrides.get(base, self._get_field_boost(base, lang)))
-            specs.append((field, boost))
-
+            out.append(self._format_field_with_boost(path, boost))
         for shared in term_fields:
             boost = float(overrides.get(shared, self._get_field_boost(shared, None)))
-            specs.append((shared, boost))
-        return specs
-
-    def _format_match_field_specs(self, specs: List[MatchFieldSpec]) -> List[str]:
-        """Format (field_path, boost) pairs for Elasticsearch multi_match ``fields``."""
-        return [self._format_field_with_boost(path, boost) for path, boost in specs]
-
-    def _merge_supplemental_lang_field_specs(
-        self,
-        specs: List[MatchFieldSpec],
-        supplemental_lang: str,
-    ) -> List[MatchFieldSpec]:
-        """Append supplemental-language columns; boosts multiplied by mixed_script scale."""
-        scale = float(self.mixed_script_merged_field_boost_scale)
-        extra_all = self._build_match_field_specs(supplemental_lang)
-        seen = {path for path, _ in specs}
-        out = list(specs)
-        for path, boost in extra_all:
-            if path not in seen:
-                out.append((path, boost * scale))
-                seen.add(path)
-        return out
-
-    def _expand_match_field_specs_for_mixed_script(
-        self,
-        lang: str,
-        specs: List[MatchFieldSpec],
-        contains_chinese: bool,
-        contains_english: bool,
-        index_languages: List[str],
-        is_source: bool = False
-    ) -> List[MatchFieldSpec]:
-        """
-        When the query mixes scripts, widen each clause to indexed fields for the other script
-        (e.g. zh clause also searches title.en when the query contains an English word token).
-        """
-        norm = {str(x or "").strip().lower() for x in (index_languages or []) if str(x or "").strip()}
-        allow = norm or {"zh", "en"}
-
-        def can_use(lcode: str) -> bool:
-            return lcode in allow if norm else True
-
-        out = list(specs)
-        lnorm = (lang or "").strip().lower()
-        if is_source:
-            if contains_english and lnorm != "en" and can_use("en"):
-                out = self._merge_supplemental_lang_field_specs(out, "en")
-            if contains_chinese and lnorm != "zh" and can_use("zh"):
-                out = self._merge_supplemental_lang_field_specs(out, "zh")
+            out.append(self._format_field_with_boost(shared, boost))
         return out
 
     def _build_best_fields_clause(self, language: str, query_text: str) -> Optional[Dict[str, Any]]:
-        specs = self._build_match_field_specs(
+        fields = self._match_field_strings(
             language,
             multilingual_fields=list(self.best_fields_boosts),
             shared_fields=[],
             boost_overrides=self.best_fields_boosts,
         )
-        fields = self._format_match_field_specs(specs)
         if not fields:
             return None
         return {
@@ -530,13 +465,12 @@ class ESQueryBuilder:
         }
 
     def _build_phrase_clause(self, language: str, query_text: str) -> Optional[Dict[str, Any]]:
-        specs = self._build_match_field_specs(
+        fields = self._match_field_strings(
             language,
             multilingual_fields=list(self.phrase_field_boosts),
             shared_fields=[],
             boost_overrides=self.phrase_field_boosts,
         )
-        fields = self._format_match_field_specs(specs)
         if not fields:
             return None
         clause: Dict[str, Any] = {
@@ -560,20 +494,8 @@ class ESQueryBuilder:
         clause_name: str,
         *,
         is_source: bool,
-        contains_chinese: bool,
-        contains_english: bool,
-        index_languages: List[str],
     ) -> Optional[Dict[str, Any]]:
-        all_specs = self._build_match_field_specs(lang)
-        expanded_specs = self._expand_match_field_specs_for_mixed_script(
-            lang,
-            all_specs,
-            contains_chinese,
-            contains_english,
-            index_languages,
-            is_source,
-        )
-        combined_fields = self._format_match_field_specs(expanded_specs)
+        combined_fields = self._match_field_strings(lang)
         if not combined_fields:
             return None
         minimum_should_match = (
@@ -607,29 +529,10 @@ class ESQueryBuilder:
             clause["bool"]["boost"] = float(self.translation_boost)
         return clause
 
-    def _get_embedding_field(self, language: str) -> str:
-        """Get embedding field name for a language."""
-        # Currently using unified embedding field
-        return self.text_embedding_field or "title_embedding"
-    
-    @staticmethod
-    def _normalize_language_list(languages: Optional[List[str]]) -> List[str]:
-        normalized: List[str] = []
-        seen = set()
-        for language in languages or []:
-            token = str(language or "").strip().lower()
-            if not token or token in seen:
-                continue
-            seen.add(token)
-            normalized.append(token)
-        return normalized
-
     def _build_advanced_text_query(
         self,
         query_text: str,
         parsed_query: Optional[Any] = None,
-        *,
-        index_languages: Optional[List[str]] = None,
     ) -> Dict[str, Any]:
         """
         Build advanced text query using base and translated lexical clauses.
@@ -649,39 +552,26 @@ class ESQueryBuilder:
         should_clauses = []
         source_lang = self.default_language
         translations: Dict[str, str] = {}
-        contains_chinese = False
-        contains_english = False
-        normalized_index_languages = self._normalize_language_list(index_languages)
 
         if parsed_query:
             detected_lang = getattr(parsed_query, "detected_language", None)
             source_lang = detected_lang if detected_lang and detected_lang != "unknown" else self.default_language
             translations = getattr(parsed_query, "translations", None) or {}
-            contains_chinese = bool(getattr(parsed_query, "contains_chinese", False))
-            contains_english = bool(getattr(parsed_query, "contains_english", False))
 
         source_lang = str(source_lang or self.default_language).strip().lower() or self.default_language
         base_query_text = (
             getattr(parsed_query, "rewritten_query", None) if parsed_query else None
         ) or query_text
 
-        def append_clause(lang: str, lang_query: str, clause_name: str, is_source: bool) -> None:
-            nonlocal should_clauses
-            clause = self._build_lexical_language_clause(
-                lang,
-                lang_query,
-                clause_name,
-                is_source=is_source,
-                contains_chinese=contains_chinese,
-                contains_english=contains_english,
-                index_languages=normalized_index_languages,
-            )
-            if not clause:
-                return
-            should_clauses.append(clause)
-
         if base_query_text:
-            append_clause(source_lang, base_query_text, "base_query", True)
+            base_clause = self._build_lexical_language_clause(
+                source_lang,
+                base_query_text,
+                "base_query",
+                is_source=True,
+            )
+            if base_clause:
+                should_clauses.append(base_clause)
 
         for lang, translated_text in translations.items():
             normalized_lang = str(lang or "").strip().lower()
@@ -690,7 +580,14 @@ class ESQueryBuilder:
                 continue
             if normalized_lang == source_lang and normalized_text == base_query_text:
                 continue
-            append_clause(normalized_lang, normalized_text, f"base_query_trans_{normalized_lang}", False)
+            trans_clause = self._build_lexical_language_clause(
+                normalized_lang,
+                normalized_text,
+                f"base_query_trans_{normalized_lang}",
+                is_source=False,
+            )
+            if trans_clause:
+                should_clauses.append(trans_clause)
 
         # Fallback to a simple query when language fields cannot be resolved.
         if not should_clauses:
diff --git a/search/searcher.py b/search/searcher.py
index 21bbadd..5285d2c 100644
--- a/search/searcher.py
+++ b/search/searcher.py
@@ -645,7 +645,6 @@ class Searcher:
                 enable_knn=enable_embedding and parsed_query.query_vector is not None,
                 min_score=min_score,
                 parsed_query=parsed_query,
-                index_languages=index_langs,
             )
 
             # Add facets for faceted search
diff --git a/tests/test_es_query_builder.py b/tests/test_es_query_builder.py
index bd30498..763bda2 100644
--- a/tests/test_es_query_builder.py
+++ b/tests/test_es_query_builder.py
@@ -9,6 +9,9 @@ from search.es_query_builder import ESQueryBuilder
 def _builder() -> ESQueryBuilder:
     return ESQueryBuilder(
         match_fields=["title.en^3.0", "brief.en^1.0"],
+        multilingual_fields=["title", "brief"],
+        core_multilingual_fields=["title", "brief"],
+        shared_fields=[],
         text_embedding_field="title_embedding",
         default_language="en",
     )
@@ -25,10 +28,6 @@ def _lexical_clause(query_root: Dict[str, Any]) -> Dict[str, Any]:
     raise AssertionError("no lexical bool clause in query_root")
 
 
-def _lexical_combined_fields(query_root: Dict[str, Any]) -> list:
-    return _lexical_clause(query_root)["must"][0]["combined_fields"]["fields"]
-
-
 def test_knn_prefilter_includes_range_filters():
     qb = _builder()
     q = qb.build_query(
@@ -93,7 +92,6 @@ def test_text_query_contains_only_base_and_translation_named_queries():
         query_text="dress",
         parsed_query=parsed_query,
         enable_knn=False,
-        index_languages=["en", "zh", "fr"],
     )
     should = q["query"]["bool"]["should"]
     names = [clause["bool"]["_name"] for clause in should]
@@ -115,120 +113,8 @@ def test_text_query_skips_duplicate_translation_same_as_base():
         query_text="dress",
         parsed_query=parsed_query,
         enable_knn=False,
-        index_languages=["en", "zh"],
     )
 
     root = q["query"]
     assert root["bool"]["_name"] == "base_query"
     assert [clause["multi_match"]["type"] for clause in root["bool"]["should"]] == ["best_fields", "phrase"]
-
-
-def test_mixed_script_merges_en_fields_into_zh_clause():
-    qb = ESQueryBuilder(
-        match_fields=["title.en^3.0"],
-        multilingual_fields=["title", "brief"],
-        shared_fields=[],
-        text_embedding_field="title_embedding",
-        default_language="en",
-    )
-    parsed_query = SimpleNamespace(
-        rewritten_query="法式 dress",
-        detected_language="zh",
-        translations={},
-        contains_chinese=True,
-        contains_english=True,
-    )
-    q = qb.build_query(
-        query_text="法式 dress",
-        parsed_query=parsed_query,
-        enable_knn=False,
-        index_languages=["zh", "en"],
-    )
-    fields = _lexical_combined_fields(q["query"])
-    bases = {f.split("^", 1)[0] for f in fields}
-    assert "title.zh" in bases and "title.en" in bases
-    assert "brief.zh" in bases and "brief.en" in bases
-    # Merged supplemental language fields use boost * 0.6 by default.
-    assert "title.en^0.6" in fields
-    assert "brief.en^0.6" in fields
-
-
-def test_mixed_script_merges_zh_fields_into_en_clause():
-    qb = ESQueryBuilder(
-        match_fields=["title.en^3.0"],
-        multilingual_fields=["title"],
-        shared_fields=[],
-        text_embedding_field="title_embedding",
-        default_language="en",
-    )
-    parsed_query = SimpleNamespace(
-        rewritten_query="red 连衣裙",
-        detected_language="en",
-        translations={},
-        contains_chinese=True,
-        contains_english=True,
-    )
-    q = qb.build_query(
-        query_text="red 连衣裙",
-        parsed_query=parsed_query,
-        enable_knn=False,
-        index_languages=["zh", "en"],
-    )
-    fields = _lexical_combined_fields(q["query"])
-    bases = {f.split("^", 1)[0] for f in fields}
-    assert "title.en" in bases and "title.zh" in bases
-    assert "title.zh^0.6" in fields
-
-
-def test_mixed_script_merged_fields_scale_configured_boosts():
-    qb = ESQueryBuilder(
-        match_fields=["title.en^3.0"],
-        multilingual_fields=["title"],
-        shared_fields=[],
-        field_boosts={"title.zh": 5.0, "title.en": 10.0},
-        text_embedding_field="title_embedding",
-        default_language="en",
-    )
-    parsed_query = SimpleNamespace(
-        rewritten_query="法式 dress",
-        detected_language="zh",
-        translations={},
-        contains_chinese=True,
-        contains_english=True,
-    )
-    q = qb.build_query(
-        query_text="法式 dress",
-        parsed_query=parsed_query,
-        enable_knn=False,
-        index_languages=["zh", "en"],
-    )
-    fields = _lexical_combined_fields(q["query"])
-    assert "title.zh^5.0" in fields
-    assert "title.en^6.0" in fields  # 10.0 * 0.6
-
-
-def test_mixed_script_does_not_merge_en_when_not_in_index_languages():
-    qb = ESQueryBuilder(
-        match_fields=["title.zh^3.0"],
-        multilingual_fields=["title"],
-        shared_fields=[],
-        text_embedding_field="title_embedding",
-        default_language="zh",
-    )
-    parsed_query = SimpleNamespace(
-        rewritten_query="法式 dress",
-        detected_language="zh",
-        translations={},
-        contains_chinese=True,
-        contains_english=True,
-    )
-    q = qb.build_query(
-        query_text="法式 dress",
-        parsed_query=parsed_query,
-        enable_knn=False,
-        index_languages=["zh"],
-    )
-    fields = _lexical_combined_fields(q["query"])
-    bases = {f.split("^", 1)[0] for f in fields}
-    assert "title.zh" in bases
-    assert "title.en" not in bases
diff --git a/tests/test_es_query_builder_text_recall_languages.py b/tests/test_es_query_builder_text_recall_languages.py
index a115028..6db0c1e 100644
--- a/tests/test_es_query_builder_text_recall_languages.py
+++ b/tests/test_es_query_builder_text_recall_languages.py
@@ -1,9 +1,9 @@
 """
 ES text recall: base_query (rewritten @ detected_language) + base_query_trans_*.
 
-Covers combinations of query language vs tenant index_languages, translations,
-and mixed Chinese/English queries. Asserts named lexical clause boundaries,
-combined_fields payloads, and per-language target fields (title.{lang}).
+Covers translation routing, mixed-script queries (per-clause language fields only),
+and clause naming. Asserts named lexical clause boundaries, combined_fields payloads,
+and per-language target fields (title.{lang}).
 """
 
 from types import SimpleNamespace
@@ -14,11 +14,7 @@ import numpy as np
 from search.es_query_builder import ESQueryBuilder
 
 
-def _builder_multilingual_title_only(
-    *,
-    default_language: str = "en",
-    mixed_script_scale: float = 0.6,
-) -> ESQueryBuilder:
+def _builder_multilingual_title_only(*, default_language: str = "en") -> ESQueryBuilder:
     """Minimal builder: only title.{lang} for easy field assertions."""
     return ESQueryBuilder(
         match_fields=["title.en^1.0"],
@@ -26,7 +22,6 @@ def _builder_multilingual_title_only(
         shared_fields=[],
         text_embedding_field="title_embedding",
         default_language=default_language,
-        mixed_script_merged_field_boost_scale=mixed_script_scale,
         function_score_config=None,
     )
 
@@ -101,22 +96,16 @@ def _build(
     rewritten: str,
     detected_language: str,
     translations: Dict[str, str],
-    index_languages: List[str],
-    contains_chinese: bool = False,
-    contains_english: bool = False,
 ) -> Dict[str, Any]:
     parsed = SimpleNamespace(
         rewritten_query=rewritten,
         detected_language=detected_language,
         translations=dict(translations),
-        contains_chinese=contains_chinese,
-        contains_english=contains_english,
     )
     return qb.build_query(
         query_text=query_text,
         parsed_query=parsed,
         enable_knn=False,
-        index_languages=index_languages,
     )
 
 
@@ -131,7 +120,6 @@ def test_zh_query_index_zh_en_includes_base_zh_and_trans_en():
         rewritten="连衣裙",
         detected_language="zh",
         translations={"en": "dress"},
-        index_languages=["zh", "en"],
     )
     idx = _clauses_index(q)
     assert set(idx) == {"base_query", "base_query_trans_en"}
@@ -149,7 +137,6 @@ def test_en_query_index_zh_en_includes_base_en_and_trans_zh():
         rewritten="dress",
         detected_language="en",
         translations={"zh": "连衣裙"},
-        index_languages=["en", "zh"],
     )
     idx = _clauses_index(q)
     assert set(idx) == {"base_query", "base_query_trans_zh"}
@@ -167,7 +154,6 @@ def test_de_query_index_de_en_fr_includes_base_and_two_translations():
         rewritten="kleid",
         detected_language="de",
         translations={"en": "dress", "fr": "robe"},
-        index_languages=["de", "en", "fr"],
     )
     idx = _clauses_index(q)
     assert set(idx) == {"base_query", "base_query_trans_en", "base_query_trans_fr"}
@@ -188,7 +174,6 @@ def test_de_query_index_only_en_zh_base_on_de_translations_on_target_fields():
         rewritten="schuh",
         detected_language="de",
         translations={"en": "shoe", "zh": "鞋"},
-        index_languages=["en", "zh"],
     )
     idx = _clauses_index(q)
     assert set(idx) == {"base_query", "base_query_trans_en", "base_query_trans_zh"}
@@ -201,10 +186,10 @@ def test_de_query_index_only_en_zh_base_on_de_translations_on_target_fields():
     assert idx["base_query_trans_zh"]["boost"] == qb.translation_boost
 
 
-# --- 中英混写：原文在 base_query；翻译子句独立；混写时 base 子句扩列 ---
+# --- 中英混写：base 打在检测语种字段；翻译子句打在译文语种字段 ---
 
 
-def test_mixed_zh_primary_with_en_translation_merges_en_into_zh_base_clause():
+def test_mixed_zh_detected_base_clause_zh_fields_only_with_en_translation():
     qb = _builder_multilingual_title_only(default_language="en")
     q = _build(
         qb,
@@ -212,19 +197,16 @@ def test_mixed_zh_primary_with_en_translation_merges_en_into_zh_base_clause():
         rewritten="红色 dress",
         detected_language="zh",
         translations={"en": "red dress"},
-        index_languages=["zh", "en"],
-        contains_chinese=True,
-        contains_english=True,
     )
     idx = _clauses_index(q)
     assert set(idx) == {"base_query", "base_query_trans_en"}
     assert _combined_fields_clause(idx["base_query"])["query"] == "红色 dress"
-    assert _has_title_lang(idx["base_query"], "zh") and _has_title_lang(idx["base_query"], "en")
+    assert _has_title_lang(idx["base_query"], "zh") and not _has_title_lang(idx["base_query"], "en")
     assert _combined_fields_clause(idx["base_query_trans_en"])["query"] == "red dress"
     assert _has_title_lang(idx["base_query_trans_en"], "en")
 
 
-def test_mixed_en_primary_with_zh_translation_merges_zh_into_en_base_clause():
+def test_mixed_en_detected_base_clause_en_fields_only_with_zh_translation():
     qb = _builder_multilingual_title_only(default_language="en")
     q = _build(
         qb,
@@ -232,18 +214,15 @@ def test_mixed_en_primary_with_zh_translation_merges_zh_into_en_base_clause():
         rewritten="nike 运动鞋",
         detected_language="en",
         translations={"zh": "耐克运动鞋"},
-        index_languages=["zh", "en"],
-        contains_chinese=True,
-        contains_english=True,
     )
     idx = _clauses_index(q)
     assert set(idx) == {"base_query", "base_query_trans_zh"}
     assert _combined_fields_clause(idx["base_query"])["query"] == "nike 运动鞋"
-    assert _has_title_lang(idx["base_query"], "en") and _has_title_lang(idx["base_query"], "zh")
+    assert _has_title_lang(idx["base_query"], "en") and not _has_title_lang(idx["base_query"], "zh")
     assert _combined_fields_clause(idx["base_query_trans_zh"])["query"] == "耐克运动鞋"
 
 
-def test_mixed_zh_query_index_zh_only_no_en_merge_in_base():
+def test_zh_query_no_translations_only_zh_fields():
     qb = _builder_multilingual_title_only(default_language="en")
     q = _build(
         qb,
@@ -251,9 +230,6 @@ def test_mixed_zh_query_index_zh_only_no_en_merge_in_base():
         rewritten="法式 dress",
         detected_language="zh",
         translations={},
-        index_languages=["zh"],
-        contains_chinese=True,
-        contains_english=True,
     )
     idx = _clauses_index(q)
     assert set(idx) == {"base_query"}
@@ -272,7 +248,6 @@ def test_skips_translation_when_same_lang_and_same_text_as_base():
         rewritten="NIKE",
         detected_language="en",
         translations={"en": "NIKE", "zh": "耐克"},
-        index_languages=["en", "zh"],
     )
     idx = _clauses_index(q)
     assert set(idx) == {"base_query", "base_query_trans_zh"}
@@ -286,7 +261,6 @@ def test_keeps_translation_when_same_text_but_different_lang_than_base():
         rewritten="NIKE",
         detected_language="en",
         translations={"zh": "NIKE"},
-        index_languages=["en", "zh"],
     )
     idx = _clauses_index(q)
     assert set(idx) == {"base_query", "base_query_trans_zh"}
@@ -304,7 +278,6 @@ def test_translation_language_key_is_normalized_case_insensitive():
         rewritten="dress",
         detected_language="en",
         translations={"ZH": "连衣裙"},
-        index_languages=["en", "zh"],
     )
     idx = _clauses_index(q)
     assert "base_query_trans_zh" in idx
@@ -319,17 +292,16 @@ def test_empty_translation_value_is_skipped():
         rewritten="dress",
         detected_language="en",
         translations={"zh": "  ", "fr": "robe"},
-        index_languages=["en", "zh", "fr"],
     )
     idx = _clauses_index(q)
     assert "base_query_trans_zh" not in idx
     assert "base_query_trans_fr" in idx
 
 
-# --- index_languages 为空：视为「未约束」source_in_index 为 True ---
+# --- base 子句无 bool.boost；翻译子句带 translation_boost；phrase should 继承 phrase_match_boost ---
 
 
-def test_empty_index_languages_treats_source_as_in_index_boosts():
+def test_de_base_and_en_translation_phrase_boosts():
     qb = _builder_multilingual_title_only(default_language="en")
     q = _build(
         qb,
@@ -337,7 +309,6 @@ def test_empty_index_languages_treats_source_as_in_index_boosts():
         rewritten="x",
         detected_language="de",
         translations={"en": "y"},
-        index_languages=[],
     )
     idx = _clauses_index(q)
     assert "boost" not in idx["base_query"]
@@ -359,7 +330,6 @@ def test_no_translations_only_base_query():
         rewritten="hello",
         detected_language="en",
         translations={},
-        index_languages=["en", "zh"],
     )
     idx = _clauses_index(q)
     assert set(idx) == {"base_query"}
@@ -374,15 +344,12 @@ def test_text_clauses_present_alongside_knn():
         rewritten_query="dress",
         detected_language="en",
         translations={"zh": "连衣裙"},
-        contains_chinese=False,
-        contains_english=True,
     )
     q = qb.build_query(
         query_text="dress",
         query_vector=np.array([0.1, 0.2, 0.3], dtype=np.float32),
         parsed_query=parsed,
         enable_knn=True,
-        index_languages=["en", "zh"],
     )
     assert "knn" in q
     idx = _clauses_index(q)
@@ -396,14 +363,11 @@ def test_detected_language_unknown_falls_back_to_default_language():
         rewritten_query="shirt",
         detected_language="unknown",
         translations={"zh": "衬衫"},
-        contains_chinese=False,
-        contains_english=True,
     )
     q = qb.build_query(
         query_text="shirt",
         parsed_query=parsed,
         enable_knn=False,
-        index_languages=["en", "zh"],
     )
     idx = _clauses_index(q)
     assert set(idx) == {"base_query", "base_query_trans_zh"}
@@ -419,7 +383,6 @@ def test_ru_query_index_ru_en_includes_base_ru_and_trans_en():
         rewritten="платье",
         detected_language="ru",
         translations={"en": "dress"},
-        index_languages=["ru", "en"],
     )
     idx = _clauses_index(q)
     assert set(idx) == {"base_query", "base_query_trans_en"}
@@ -428,11 +391,8 @@ def test_ru_query_index_ru_en_includes_base_ru_and_trans_en():
     assert _combined_fields_clause(idx["base_query_trans_en"])["query"] == "dress"
 
 
-def test_translation_for_lang_not_listed_in_index_languages_still_generates_clause():
-    """
-    当前实现：凡是 translations 里非空的条目都会生成子句；
-    index_languages 只约束混写扩列，不用于过滤翻译子句。
-    """
+def test_translation_generates_clause_for_any_target_lang_key():
+    """translations 里非空的每个语种键都会生成对应 base_query_trans_* 子句。"""
     qb = _builder_multilingual_title_only(default_language="en")
     q = _build(
         qb,
@@ -440,7 +400,6 @@ def test_translation_for_lang_not_listed_in_index_languages_still_generates_clau
         rewritten="dress",
         detected_language="en",
         translations={"zh": "连衣裙", "de": "Kleid"},
-        index_languages=["en", "zh"],
     )
     idx = _clauses_index(q)
     assert "base_query_trans_de" in idx
@@ -457,9 +416,6 @@ def test_mixed_detected_zh_rewrite_differs_from_query_text_uses_rewritten_in_bas
         rewritten="红色连衣裙",
         detected_language="zh",
         translations={"en": "red dress"},
-        index_languages=["zh", "en"],
-        contains_chinese=True,
-        contains_english=False,
     )
     idx = _clauses_index(q)
     assert _combined_fields_clause(idx["base_query"])["query"] == "红色连衣裙"
diff --git a/tests/test_query_parser_mixed_language.py b/tests/test_query_parser_mixed_language.py
index 70d2502..dcae93a 100644
--- a/tests/test_query_parser_mixed_language.py
+++ b/tests/test_query_parser_mixed_language.py
@@ -11,14 +11,6 @@ def _tokenizer(text):
     return str(text).split()
 
 
-def test_pure_english_word_token_length_and_script():
-    assert QueryParser._is_pure_english_word_token("ab") is False
-    assert QueryParser._is_pure_english_word_token("abc") is True
-    assert QueryParser._is_pure_english_word_token("wi-fi") is True
-    assert QueryParser._is_pure_english_word_token("连衣裙") is False
-    assert QueryParser._is_pure_english_word_token("ab12") is False
-
-
 def _build_config() -> SearchConfig:
     return SearchConfig(
         es_index_name="test_products",
@@ -36,7 +28,7 @@ def _build_config() -> SearchConfig:
     )
 
 
-def test_parse_adds_en_fields_for_mixed_chinese_query_with_meaningful_english(monkeypatch):
+def test_parse_mixed_zh_query_translates_to_en(monkeypatch):
     parser = QueryParser(_build_config(), translator=_DummyTranslator(), tokenizer=_tokenizer)
     monkeypatch.setattr(parser.language_detector, "detect", lambda text: "zh")
 
@@ -48,15 +40,13 @@ def test_parse_adds_en_fields_for_mixed_chinese_query_with_meaningful_english(mo
     )
 
     assert result.detected_language == "zh"
-    assert result.contains_chinese is True
-    assert result.contains_english is True
     assert result.translations == {"en": "法式 dress 连衣裙-en"}
     assert result.query_tokens == ["法式", "dress", "连衣裙"]
     assert not hasattr(result, "query_text_by_lang")
     assert not hasattr(result, "search_langs")
 
 
-def test_parse_adds_zh_fields_for_english_query_when_cjk_present(monkeypatch):
+def test_parse_mixed_en_query_translates_to_zh(monkeypatch):
     parser = QueryParser(_build_config(), translator=_DummyTranslator(), tokenizer=_tokenizer)
     monkeypatch.setattr(parser.language_detector, "detect", lambda text: "en")
 
@@ -68,8 +58,6 @@ def test_parse_adds_zh_fields_for_english_query_when_cjk_present(monkeypatch):
     )
 
     assert result.detected_language == "en"
-    assert result.contains_chinese is True
-    assert result.contains_english is True
     assert result.translations == {"zh": "red 连衣裙-zh"}
     assert result.query_tokens == ["red", "连衣裙"]
 
@@ -87,7 +75,5 @@ def test_parse_waits_for_translation_when_source_in_index_languages(monkeypatch)
     )
 
     assert result.detected_language == "en"
-    assert result.contains_chinese is False
-    assert result.contains_english is True
     assert result.translations.get("zh") == "off shoulder top-zh"
     assert not hasattr(result, "source_in_index_languages")
--
libgit2 0.21.2