Updated 在线授课接口定义 (markdown)

@@ -73,10 +73,10 @@ Response：
         "cover": "73dcb39a42bbfd6b3cc83b2569cf4bce"
       },
       "achievement_info": {
-        "read_word_count": 0,
-        "listening_time": 0,
-        "record_time": 0,
-        "word_count": 209
+        "read_word_count": "0词",
+        "listening_time": "0秒",
+        "record_time": "0秒",
+        "word_count": "3词"
       },
       "course_type_info": {
         "course_type_ratio": [