"车次"是火车或长途汽车的班次号码，用来告诉你坐的是哪一趟车。

"车次" is the train or long-distance bus number that tells you which trip you are taking.

买票和上车的时候，你常常要看清楚车次。

When buying tickets and boarding, you often need to check the 车次 carefully.