这个工具是干什么用的？

What is this tool for?

《牛津词典》

先生，这个池子是干什么用的啊？

Sir, what is this pool used for?

youdao

那个大铜锣和锤子是干什么用的？

What is the big brass gong and hammer for?

youdao

There's one more piece that we'd like to get out of that, and that is-- you may have been wondering, what's with the funky stuttering here of three double-quotes in a row. All right? And that is a specification.

但是你没有屏蔽这个函数的使用细节,在这里我们还想再讲一讲,那就是--你可能正在想,这里连续3个奇怪双引号,是干什么用的。

麻省理工公开课 - 计算机科学及编程导论课程节选