The phone ringing interrupted my train of thought.

电话铃打断我的思绪。

The telephone rang and interrupted my train of thought.

电话铃响, 打断我的思路。

If I am once put off I find it very difficult to recapture the same train of thought.

我一旦受到打扰, 发觉自己很难回到原来的思路上来。