We went to the library in twos and threes,为什么用介词in

We went to the library in twos and threes,为什么用介词in they went to the theatre in twos and threes. in twos and threes是什么意思 为什么三三两两是这样表示in twos and threes?使用介词in呢? "in twos and threes"翻译一下 on friday afternoon ,we left school in twos and threes,headi The students came into the classroom in twos and threes 一句中为 count in twos count in threes是什么意思 in twos and threes、black and blue、in black and white、Tom,Dic 数字成语趣译：in twos and threes be perfect in everyway 是数字成语哦 英语：数字成语趣译1.in twos and threes _________2.agaon and again ___ and we also have to be quiet in the library为什么不说and we have