diff --git a/AIProofread/Model/ExportDataItem.cs b/AIProofread/Model/ExportDataItem.cs
index df3e259..fd74d96 100644
--- a/AIProofread/Model/ExportDataItem.cs
+++ b/AIProofread/Model/ExportDataItem.cs
@@ -1,5 +1,6 @@
 using Microsoft.Office.Interop.Word;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Text;
 using UtilLib;
 
@@ -30,6 +31,22 @@ namespace AIProofread.Model
             {
                 return sentence;
             }
+            // 截取中间位置
+            var middlePosition = MAX_WORD_LENGTH / 2;
+            var cutStart = item.content.Start - middlePosition;
+            // 越界了
+            if(cutStart < 0)
+            {
+                cutStart = 0;
+            }
+            var originText = sentence.Substring(cutStart, MAX_WORD_LENGTH);
+            Debug.WriteLine($"{cutStart} {originText}");
+            if (!isInsert)
+            {
+                item.content.Start = item.content.Start - cutStart;
+                item.content.End = item.content.End - cutStart;
+                return originText;
+            }
             var range = item.mark.Range;
 
             // 获取range所在句子
@@ -50,6 +67,7 @@ namespace AIProofread.Model
                 }
             }
             var first = sentences.First;
+            // 内容位置：用于后续标红
             item.content.Start = range.Start - first.Start;
             item.content.End = range.End - first.Start;
             return sb.ToString().Trim();