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?
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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?
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