必须把资料保存起来，这样才不至于无意中删除。

Information must be stored so that it is secure from accidental deletion.

《牛津词典》

所有的灯在工作前必须挂起来。

All lights must be hanged up before working.

youdao

一个自我管理的体系要运作起来，必须得到所有相关人员的一致认可。

For a self-regulatory system to work, the consent of all those involved is required.

《柯林斯英汉双解大词典》

Usually when you know why it's not working, it's obvious what you have to do to make it work.

通常你明白了出错的原因后，很明显你必须让程序正常运行起来。

麻省理工公开课 - 计算机科学及编程导论课程节选

That sounds funny, but in a sense, that is--we have to define the sense in which it's irrelevant.

听起来很有意思,但从某种意义上讲,我们必须说清楚不相关性的含义

耶鲁公开课 - 金融市场课程节选

So if I try to rotate my 2 atoms, you see that I have to break that pi bond, because they need to be lined up so that the electron density can overlap.

如果我要试着转动两个原子，你会看到我必须要打破一个π键，因为他们需要连接起来,让那些电子能够重叠。

麻省理工公开课 - 化学原理课程节选