我当然害怕，但我有一种强烈的“必须这么做”的感觉。

Of course I was scared, yet I had this strong sense of "I have to do this".

youdao

他回答说：“我这么做是因为我必须这么做。”

He replies, "I act because I must."

youdao

他们必须这么做。

They've got to do it.

youdao

Well clearly what I probably want to do here is what? Print these same two things.

看看我得到了什么，哦,我必须，当然也得这么做。

麻省理工公开课 - 计算机科学及编程导论课程节选

I think there are a lot of steps that we can and should take towards mitigating it,

我认为我们有许多方法来减缓气候变暖，而且我们也必须这么做。

喜欢环境法课程 - SpeakingMax英语口语达人

All right, so I did this not at all purposely, but this can point out for you that you need to make sure that the number of electrons that you have in your molecular orbital does match up with the total number that you have in your atomic orbitals.

我并不是故意这么做的，但这告诉我们必须要保证,分子轨道里的电子数,和原子轨道里的,总电子数能对上。

麻省理工公开课 - 化学原理课程节选