在一辆密封的公交车上，如果燃气发生泄漏达到一定密度并有火花引燃就可能造成一场大火。

A gas leak aboard a sealed bus could cause a major fire if it grew dense enough and was ignited by a spark.

youdao

一定不止一个年轻男孩梦想某一天会拥有一辆奔驰车。

There must be many a young boy who dreams of one day owning a Mercedes.

youdao

我给它一定速度，第一辆车获得速度。

I get a certain velocity, which I put into the first car.

youdao