[题目]All efforts of cloning an animal will be in v if there is not enough diversity in the group to overcome illnesses. 题目和参考答案——青夏教育精英家教网——

题目内容

【题目】All efforts of cloning an animal will be in v（徒劳） if there is not enough diversity in the group to overcome illnesses.

【答案】vain
【解析】In vain是固定用法，意思是徒劳。

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