我必须这样做——尽管我不知道为什么。

I must—though I don't know why.

youdao

从逻辑上讲，总有一天他们必须这样做：因为地球是一个有限的空间。

Logically, one day they must: the planet is a finite place.

youdao

我花钱通常是很明智的。考虑到自己挣得不多，必须这样做。

Usually, I am sensible with money, as I have to be, given that I don't earn that much.

《柯林斯英汉双解大词典》

Redleaf went in and said, you should really do it and he convinced them, apparently, and they cut their dividend.

莱德利夫提出,你们必须要这样做,而且他说服了管理层,最终经营者决定降低红利

耶鲁公开课 - 金融市场课程节选

So I think at least in our own case, it's not that I wish things were different, but I know we have to constantly balance and reinforce and build and sort of reinforce the behaviors we need in whatever business at that point in time.

所以我想至少对我们而言，并不是我希望事情能够有所不同就可以的，但是我知道必须不断的作出平衡,并加强，创立，再加强自身,在这个时期不论从事什么都必须这样做。

斯坦福公开课 - 微软CEO-Steve.Ballmer谈科技的未来课程节选

But,in those days in high school-- but anyway, there we go--you'd go and do these things, and it would be a big sort of public spectacle,a spectacle.

不过那时候的高中--无论如何,就是那样--你必须去做这样的事情,那是个大型的公共活动

耶鲁公开课 - 1871年后的法国课程节选