in the whole semester, and it may be the most important thing

最重要的知识甚至有可能
you're going to learn at Yale.

是你们在耶鲁学到的最重要的内容
It's the answer to all questions.

它能解决一切的问题
If I ask you a question, and, as happens from time to time,

假如我问你一个问题和往常一样
you've been sleeping in class and you wake up

你当时正好在课堂上睡着了
startled because I've now asked you a question,

你被叫醒了以后
and that camera is on you,

无助地对着镜头
and you don't know what the question is,

完全不知道我问的是什么问题
then the answer is backward induction.

但是你可以回答逆向归纳法
I'm stressing this because six weeks from now, whatever it is, in December,

我强调一下在六周后
there's going to be a final exam and I guarantee

应该是十二月的期末考试里
now that there will be a question on the final exam

肯定会有一个题目