You must never think of anything except the need and how to meet it."

VOA: special.2009.07.26

And so the big issue is -- this is what you must never do, but this is what you got to do if your phalanx is broken.

所以现在的大问题是,这也许是你在战场上永远不能做的事,但你在方阵被打散时不得不这么干

耶鲁公开课 - 古希腊历史简介课程节选

Ok I've never even seen it, so that's good -- you must be better travelled than I.

有一部分，我从来没见过这是什么,很好，你们旅游的比我多哈。

麻省理工公开课 - 化学原理课程节选

"But you must never tell anyone I told you this."

VOA: special.2009.12.26

Ryan. Ryan, I must have you here as well, never mind. What did you choose?

瑞恩,我这儿肯定也有你的数,不要紧,你选了什么

耶鲁公开课 - 博弈论课程节选

Every child, every one of you, every one of us was brought up to know that one must never do wrong, even if good consequences are seen to follow.

每一个小孩，在座的各位，我们每一个人都从小被教育,不要做坏事，就算结果是善也不行。

耶鲁公开课 - 政治哲学导论课程节选