Aha! So to study and grasp things about dead bodies, corpses, you must yourself be a dead body.

所以为了研究并掌握关于尸体的知识,你自己必须先是一具死尸

耶鲁公开课 - 死亡课程节选

It's very easy to use. But something you really should master.

这个句型很容易就能学会，这也是你必须得掌握的一个句型。

When 课堂 - SpeakingMax英语口语达人

In other words, to understand and cope with the problems that we all face, we all need to know and to grapple with the Western experience.

换句话说,为了理解并解决我们所面对的问题,我们必须了解并掌握西方文明的经验

耶鲁公开课 - 古希腊历史简介课程节选

This is the kind of thing you should be able to deduce.

你们必须掌握推导这类问题的方法

耶鲁公开课 - 基础物理课程节选

Now, I've highlighted three of these in blue here, imaging, mechanics, and biomolecular engineering because if you go on to study Biomedical Engineering here at Yale anyway, these are the things that you might pick to emphasize on.

我把这三条用蓝色字强调出来,影像学,生物机械学,和生物分子工程,如果你们继续在耶鲁学习生物医学工程,这些内容是你们必须重点掌握的

耶鲁公开课 - 生物医学工程探索课程节选

We'll talk about some chemistry today, what DNA molecules are like, why they have the behavior that they do, and you need to understand this in order to understand how you manipulate DNA.

今天我们会谈到一些化学结构,比如DNA分子的形态,它们为什么会以这种形态存在,你必须先掌握这些,才能理解如何操控DNA

耶鲁公开课 - 生物医学工程探索课程节选