【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.
在线课程【答案】vain
【解析】In vain是固定用法，意思是徒劳。
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All efforts of cloning an animal will be in v if there is not enough diversity in the group to overc
编辑：chaxungu时间：2026-04-27 03:02:13分类：高中英语题库
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