Don't open the door while the train is in motion.

列车运行时，请勿打开车门。

《新英汉大辞典》

IT WAS like watching a train crash in slow motion.

这就像观看火车相撞的慢镜头。

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The train was again in rapid motion. Hurstwood changed the subject.

火车又飞奔起来。赫斯渥换了一个话题。

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The train was in motion.

火车开动了。

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The train was in motion.

火车开动了。

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