医生们认为必须把他送进精神病院。

Th' doctors thought he'd have to be put in a 'sylum.

youdao

这个男孩非常爱他的妹妹，因为他认为必须保护好她。

The boy loves his little sister very much so he thinks he must protect her.

youdao

我不认为必须通过婚姻才可以有孩子。

I don't believe that we must have children only through marriage.

youdao

No. 2, we believe that young people have to be a key part of building that ethos One of the reasons for that is purely demographic.

其次，我们认为青年人,必须成为建立该社会风气的主力,其中的一个原因,纯粹是从人口统计学来考虑的。

普林斯顿公开课 - 人性课程节选

But Aristotle used to think that if you want something to move, there has to be some agency making it move.

但亚里士多德认为,如果要让物体运动,那就必须有某种作用让它运动

耶鲁公开课 - 基础物理课程节选

There has to be a sense, moving from sentence to sentence, that something is likely to happen next.

必须有一种感觉，从一句话到另一句话，认为接下来会发生什么。

耶鲁公开课 - 文学理论导论课程节选