I don't need to understand the cause of this illness.

我不需去了解这个病的起因。

youdao

I tried so hard for so many years, but I have never understood him. Now, I don't need to understand, and I don't want to. Whether to die or to live, he is now in my hands, I can do whatever I want.

我努力了那么多年，从来都不懂他的，不过现在已经不需要懂也不想懂了，是死是活，他如今在我手里，我想怎样都行。

youdao

Like I said, you don't need a book to understand these few basic things, all of which are backed up by psychological research studies.

正如我所说的，你不必去读一本书来明白这些基本的道理，这些都是经过心理学研究验证了的。

youdao

I don't expect you'll all immediately grab it, but you will need to understand it before the quiz comes along.

我不期望你们马上就能掌握，但是你们需要在,考试前弄懂它。

麻省理工公开课 - 计算机科学及编程导论课程节选

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