diff --git a/docutranslate/agents/agent.py b/docutranslate/agents/agent.py
index 47d7966..c27e625 100644
--- a/docutranslate/agents/agent.py
+++ b/docutranslate/agents/agent.py
@@ -32,9 +32,10 @@ class AgentResultError(ValueError):
 class PartialAgentResultError(ValueError):
     """一个特殊的异常，用于表示结果不完整但包含了部分成功的数据，以便触发重试。该错误不计入总错误数"""
 
-    def __init__(self, message, partial_result: dict):
+    def __init__(self, message, partial_result: dict,append_prompt:str=None):
         super().__init__(message)
         self.partial_result = partial_result
+        self.append_prompt=append_prompt
 
 
 @dataclass(kw_only=True)
@@ -327,6 +328,8 @@ class Agent:
             self.logger.error(f"收到部分返回结果，将尝试重试: {e}")
             current_partial_result = e.partial_result
             should_retry = True
+            if e.append_prompt:
+                prompt+=e.append_prompt
             # is_hard_error 保持 False
 
         # 捕获硬错误
diff --git a/docutranslate/agents/segments_agent.py b/docutranslate/agents/segments_agent.py
index 17c4145..2f0c7c0 100644
--- a/docutranslate/agents/segments_agent.py
+++ b/docutranslate/agents/segments_agent.py
@@ -79,7 +79,7 @@ class SegmentsTranslateAgentConfig(AgentConfig):
     to_lang: str
     custom_prompt: str | None = None
     glossary_dict: dict[str, str] | None = None
-    json_format:bool = True
+    json_format:bool = False
 
 
 class SegmentsTranslateAgent(Agent):
@@ -147,8 +147,9 @@ class SegmentsTranslateAgent(Agent):
                 for key in missing_keys:
                     final_chunk[key] = str(original_chunk[key])
 
+
                 # 抛出自定义异常，将部分结果和错误信息一起传递出去
-                raise PartialAgentResultError("键不匹配，触发重试", partial_result=final_chunk)
+                raise PartialAgentResultError("键不匹配，触发重试", partial_result=final_chunk,append_prompt=f"\nThe following keys must be included:{','.join(sorted(list(missing_keys)))}")
 
             # 如果键完全匹配（理想情况），正常返回
             for key, value in repaired_result.items():
diff --git a/docutranslate/translator/ai_translator/txt_translator.py b/docutranslate/translator/ai_translator/txt_translator.py
index e09ee9e..28497b7 100644
--- a/docutranslate/translator/ai_translator/txt_translator.py
+++ b/docutranslate/translator/ai_translator/txt_translator.py
@@ -32,7 +32,7 @@ class TXTTranslatorConfig(AiTranslatorConfig):
     """
     insert_mode: Literal["replace", "append", "prepend"] = "replace"
     separator: str = "\n"
-    segment_mode: Literal["line", "paragraph"] = "line"
+    segment_mode: Literal["line", "paragraph", "none"] = "line"
 
 
 class TXTTranslator(AiTranslator):
@@ -91,8 +91,10 @@ class TXTTranslator(AiTranslator):
 
         if self.segment_mode == "line":
             return self._segment_by_line(txt_content)
-        else:  # paragraph mode
+        elif self.segment_mode == "paragraph":  # paragraph mode
             return self._segment_by_paragraph(txt_content)
+        else:
+            return [txt_content]
 
     def _segment_by_line(self, txt_content: str) -> List[str]:
         """
@@ -153,8 +155,10 @@ class TXTTranslator(AiTranslator):
         """
         if self.segment_mode == "line":
             return self._reconstruct_by_line(translated_texts, original_texts)
-        else:  # paragraph mode
+        elif self.segment_mode == "paragraph":  # paragraph mode
             return self._reconstruct_by_paragraph(translated_texts, original_texts)
+        else:
+            return self._reconstruct_none(translated_texts, original_texts)
 
     def _reconstruct_by_line(self, translated_texts: List[str], original_lines: List[str]) -> bytes:
         """
@@ -230,6 +234,36 @@ class TXTTranslator(AiTranslator):
 
         return "\n".join(result_lines).encode('utf-8')
 
+    def _reconstruct_none(self, translated_texts: List[str], original_texts: List[str]) -> bytes:
+        """
+        不分段模式重建文档。
+
+        Args:
+            translated_texts (List[str]): 翻译后的文本列表（应只包含一个元素）
+            original_texts (List[str]): 原始文本列表（应只包含一个元素）
+
+        Returns:
+            bytes: 重建的文档内容
+        """
+        if not translated_texts or not original_texts:
+            return b""
+
+        original_text = original_texts[0]
+        translated_text = translated_texts[0]
+
+        # 根据插入模式处理
+        if self.insert_mode == "replace":
+            result_text = translated_text
+        elif self.insert_mode == "append":
+            result_text = original_text + self.separator + translated_text
+        elif self.insert_mode == "prepend":
+            result_text = translated_text + self.separator + original_text
+        else:
+            self.logger.error(f"不正确的insert_mode参数: '{self.insert_mode}'")
+            result_text = translated_text
+
+        return result_text.encode('utf-8')
+
     def translate(self, document: Document) -> Self:
         """
         同步翻译TXT文档。
@@ -341,4 +375,4 @@ class TXTTranslator(AiTranslator):
         document.content = await asyncio.to_thread(
             self._after_translate, final_translated_texts, original_segments
         )
-        return self
\ No newline at end of file
+        return self