Sorry, I couldn't help overhearing, did you mention something about...

对不起，我无意中听到你们的谈话，你们是不是提到...

That sounds like a good idea.

似乎是个好主意。

Our troop was under his command.

我们的部队由他指挥。

I'm sick and tired of your criticisms.

不要再说了，我已经听腻了你的批评。

How long does your vacation last?

你的假期有多长？

It was a pretty dumb thing to do.

做那件事真傻。