大家必须问一问自己，这个锻炼的目的是什么。

One has to ask oneself what the purpose of the exercise is.

《牛津词典》

我们大家必须与不公正和残暴作斗争。

We must all fight against unfairness and cruelty.

youdao

这座楼着火了，大家必须立即疏散。

This building is on fire, you must evacuate immediately.

youdao

I want to just go over the requirements of the course that really are required, not the optional piece, just so that you understand what my purpose is pedagogically.

我只想跟大家回顾一下,这门课程的必须要求，并非可以自由选择的,这样你们会理解我的目的何在。

耶鲁公开课 - 1945年后的美国小说课程节选

I think it's fairly clear that you don't need to appeal to souls in order to do that.

我想大家应该能非常清楚地看到,这样的诉求并非是必须的

耶鲁公开课 - 死亡课程节选

Bentham says we have to consider the welfare, the utility, the happiness of everybody.

边沁说我们必须得考虑,大众的福祉，功利，大家的幸福。

耶鲁公开课 - 公正课程节选