人们坐火车上下班。
我乘火车上班。
Does father usually go to work by train every day?
爸爸通常每天都坐火车上班么？
Dad usually goes to work by train, but today he's going by bus.
我爸爸通常乘地铁去上班，但今天他是乘公共汽车去。
Professor Boffin went to work by train. This is the train that he was on.
博芬教授乘火车去工作。这是他在的火车。
Professor Boffin went to work by train. This is the train that he was on.
博芬教授乘火车去工作。这是他在的火车。
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