有轨汽车、公共汽车、地铁在不同时期都是有效率的交通工具。

Trolley buss es buss es and subways are efficient transportation means at different stages of time.

youdao

有轨汽车、公共汽车、地铁在不同时期都是有效率的交通工具。

Trolley buss es buss es and subways are efficient transportation means at different stages of time.

youdao