把用不着的书放回书架。

Put back the books you are not using on the shelves.

《新英汉大辞典》

家里有用不着的杂物吗？

Do you have stuff in your home that you do not use?

youdao

让那些你不喜欢且用不着的东东随它去吧。

Let go of the stuff that you don't love and don't use that gets in the way of stuff that is important - which isn't really stuff at all, is it?

youdao

I want to do this carefully and slowly, and before I even start, let me point out in passing that calculus is not going to help us here.

我要慢点仔细讲这部分,在我开始之前,我需要说明微积分,在这里是用不着的

耶鲁公开课 - 博弈论课程节选