They were singing when the train entered into the station.

当火车进站的时候，他们在唱歌。

youdao

He was singing when the train entered into the station.

当火车进站的时候，他们在唱歌。

youdao

He was singing when the train entered into the station.

当火车进站的时候，他们在唱歌。

youdao