old_contents: cnendict_internal = {
      "我":"I",
      "喜欢":"like",
      "猫":"cat",
      "狗":"dog",
      "打":"beat",
      "喂":"feed",
      "溜":"walk"
  }
  
new_contents: cnendict_internal = {
      "我":"I",
      "你":"you",
      "他":"he",
      "她":"she",
      "小":"small",
      "大":"big",
      "猫":"cat",
      "狗":"dog",
      "马":"horse",
      "打":"beat",
      "喜欢":"like",
      "喂":"feed",
      "溜":"walk",
      "养":"raise",
      "爱":"love",
      "吃":"eat"
  }
  
subject: add more words