在英语中by train还是by trains

在英语中by train还是by trains they go to school by( )【train】 可以说by trains么? 英语完形填空i like travelling by train.i think trains are s_______ 英语中by bike=on a bike还是in a bike by train =on a train还是in a t by( )train take( )train by train on train 是by the train 还是take the train? 求英语作文 Travel by air vs travel by train 英语作文People travel by plane,by train,by ship,by bus.To me,the 英语by的用法例如 students go to school by trains to school.by后面的tra go by train by train 啥意思