When Ted was six we decided that he needed to know how to fasten and unfasten his seat belt.

泰德六岁时，我们决定让他知道怎样系和解他的安全带。

《柯林斯英汉双解大词典》

I decided to let them tell me what I needed to know.

我决定让他们告诉我我需要知道的事。

youdao

Anything the students needed to know was put up on the blackboard and the students copied it down into their notebooks.

学生们需要知道的东西都贴在黑板上，学生们把它抄在笔记上。

youdao

More studies are needed to know if the gel could work for humans.

VOA: special.2009.03.16

All we really needed to know about it is that this is smaller right.

我们已经知道,这部分比较小。

麻省理工公开课 - 热力学与动力学课程节选

It's possible that he genuinely didn't know what to do, that he wasn't smart enough to understand that he needed to point to the other one.

有可能他是真的不知道该做些什么,他还不够聪明,无法理解他需要指向另一个物体

耶鲁公开课 - 心理学导论课程节选

She had three older sisters, knew everything she needed to know about the possibilities of sharing.

NPR: Diaz's First Novel Details a 'Wondrous Life'

Seeing Christopher at that moment kind of told me all I needed to know.

NEWYORKER: In Plain View

If you needed to know which butcher to go to, you asked your neighbors.

FORBES: In The Era Of Transparency, Trust Is The Key To Success