They always go to school by bike.这里的bike为什么不用复数形式?

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They always go to school by bike.这里的bike为什么不用复数形式?

They always go to school by bike.这里的bike为什么不用复数形式?
They always go to school by bike.这里的bike为什么不用复数形式?

They always go to school by bike.这里的bike为什么不用复数形式?
by bike是一个固定词组,表示骑自行车
是没有by bikes这个词组的.

by通过...;用...(交通方式) 后面所接的交通工具都用单数形式。

by bike by bus 之类的是固定短语