巨大的噪音让他中断了思路。

The loud noise made him ___lose his ___train ___of ___thought.

在这篇文章中，很难跟上她复杂的思路。

It's difficult to ___follow her complex ___train ___of ___thought in this essay.

在发言前，我需要片刻安静来整理一下思路。

I need a moment of quiet to gather my ___train ___of ___thought before speaking.