Assume that you are lucky, and whenever you arrive at a subway station, a train is there that you can board immediately.

假设你很幸运，每当你到地铁站时，你总能立即乘坐地铁。

youdao

Assume that you are lucky, and whenever you arrive at a subway station, a train is there that you can board immediately.

假设你很幸运，每当你到地铁站时，你总能立即乘坐地铁。

youdao