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There are twelve months----a year and there are usually thir

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There are twelve months----a year and there are usually thirty days------a month需要理由
There are twelve months----a year and there are usually thir
There are twelve months in a year and there are usually thirty days-in-a month
一年有12个月,一个月通常有30天
再问: 为是么是in
再答: 这个是约定俗成的,这些介词的搭配通常要我们记住,而很难解释其原因