这一点的必须条件是火车会准时达到，或电车不会出轨。

This supposes that the train will arrive on schedule, or that the street-car will not jump the track.

youdao

这一点的必须条件是火车会准时达到，或电车不会出轨。

This supposes that the train will arrive on schedule, or that the street-car will not jump the track.

youdao