I’m afraid you are getting side track.

恐怕你离题了。

It was running by some cars on a side track.

它正驶过旁边轨道上的几节车厢.

So you can turn the trolley car, if you want to, onto the side track, killing the one, but sparing the five.

所以，你可以将火车开向另一条岔道——如果你愿意的话——杀死那一个工人，但救了另外五个。

It solved the difficult problems of thermal insulation or separate steam injection in general steam injection well, separate steam injection well, and side track well.

它解决了普通注汽井、分层注汽井和侧钻井的隔热或分层注汽的难题。