We are making a thorough investigation.

我们正在进行彻底的调查。

This very thorough survey goes back to 1784.

这项非常彻底的调查可追溯到1784年。

How thorough is the assessment?

这个评估的彻底程度如何？

Martin would be a good judge, I thought. He was calm and thorough.

我想马丁会是个好法官。他既沉着又细心。

To me, this seemed like a thorough waste of time.

在我看来，这好像完全是浪费时间。