diff --git a/app/difficulty.py b/app/difficulty.py
index d6ba6af..f79ca35 100644
--- a/app/difficulty.py
+++ b/app/difficulty.py
@@ -94,6 +94,7 @@ def combine_words_through_grammar(lst,d): #通过语法合并同一单词的不
         for word2 in d:
             if change_word==word2:
                 lst1[index]=change_word
+                break
     return lst1   
 
 def user_difficulty_level(d_user, d):