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

But you know, you're open to other people's schedule.

但是你了解，你必须配合大家的时间。

Let me 课堂 - SpeakingMax英语口语达人

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

It's - a suture or a stitch has to hold the wound closed so it has to have certain mechanical strength and imagine the problem of making something that's dissolvable so it disappears but also is strong enough to hold a wound closed reliably for a length of time.

能够拉紧切口的缝合线,就必须具有一定的机械张力,大家想像一下制造这种缝合线的难度,身体组织不仅要能吸收这种缝合线,而且这种线必须有足够的张力,一定时间内能够拉紧切口

耶鲁公开课 - 生物医学工程探索课程节选

It's something you can keep working on, that I need to keep working on, even Professor Raboteau needs to keep working on.

大家必须做到持之以恒，这也是我所追求的，甚至Raboteau教授也是一样。

普林斯顿公开课 - 人性课程节选

What I'm inviting you to think about is which one, if you had to choose between these two gruesome scenarios, which one would you rather save?

这里我要请大家思考的是，哪一个，如果你必须在这两个残忍情境中作出抉择，你会救哪一个？

耶鲁公开课 - 死亡课程节选