We know it has to big anyway, since we can extract heat from it without changing the temperature.

我们知道它必须很大，因为我们得从中提取热量,但不改变它的温度。

麻省理工公开课 - 热力学与动力学课程节选

That sounds funny, but in a sense, that is--we have to define the sense in which it's irrelevant.

听起来很有意思,但从某种意义上讲,我们必须说清楚不相关性的含义

耶鲁公开课 - 金融市场课程节选

He wasn't that widely read, I must admit, but it shows us how far pro-slavery could ultimately go.

我必须承认,他的作品流传不广,但他向人们展示了亲奴主义者可以走多远

耶鲁公开课 - 美国内战与重建课程节选

What this entails is just trying to stop controlling things, but I also mistake it a little bit because by stopping controlling things, you're going to control it more.

必须的是,试着放手不去控制事物，但这也是个悖论,因为想不控制事物，反而会加强控制。

普林斯顿公开课 - 人性课程节选

And,as Chateaubriand said,the writer, "I don't know what we must believe but we must believe in something," and he gets down on his knees and prays.

如作家夏多布里昂所言,"我不知道我们能相信什么,但我们必须相信点什么",然后他屈膝跪下开始祈祷

耶鲁公开课 - 1871年后的法国课程节选

I recommend it, but only credit/D/fail.

我推荐这门课，但必须坚持出勤/D/不及格。

耶鲁公开课 - 死亡课程节选

But, it doesn't always work because you have to be damn sure you're right.

但此方法也不经常奏效因为你必须得,十分肯定你的做法是正确的。

耶鲁公开课 - 金融市场课程节选