There is a law against spitting in streetcars .

有一条禁止在电车上吐痰的法律。

Are the horse-drawn streetcars free ?

这些马车是免费的吗？

A transportation system using streetcars or trolley buses .

利用路面电车或电气公共汽车的运输系统。

They got buses.why do they need streetcars ?

他们有公共汽车，干嘛还要电车呢？

Streetcars are sometimes slower than the bus lines they replace ( some of them aren 't much faster than walking ) and yet they 're wildly popular .

有轨电车有时比他们取代的公交线路开得更慢（他们中的一些不比走路快多少），然而他们却疯狂地流行起来了。