2. 外语
  3. It is difficult for the casual observer to____________(将人工湖与天然湖区别开来)

It is difficult for the casual observer to____________(将人工湖与天然湖区别开来)

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问题 It is difficult for the casual observer to____________(将人工湖与天然湖区别开来)
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答案distinguish between artificial and natural lakes
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大学英语四级

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