one by one; in turn
by turns in turn
taketurns或者taketurn
句子中这么说：do sth in turntake turns to do sth
in turn
in turnadv.依次, 轮流
take turns
take turns (to do sth.)轮流做某事。例如：We'll take turns to help you with your lessons.我们将轮流帮助你的功课。It's one's turn （to do sth.）.轮到某人（做某事）。例如：It's your turn to clean rooms.轮到你打扫房间了。希望你能采纳。
in turn, by turns
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蔡zhong凯
