They're controversial, I think for obvious reasons, because you have to sacrifice an embryo in order to get them.

这些研究极富争议,我想原因很明显,因为你必须牺牲一个胚胎来取得干细胞

耶鲁公开课 - 生物医学工程探索课程节选

I had to move here. I lived in San Francisco which is on the other side of the country.

我必须要搬到这儿来。我本来住在旧金山，正好在这个国家的另一端。

写推荐书的人 - SpeakingMax英语口语达人

We had acknowledged that Alpha is a dominant strategy for my opponent so we must choose based upon, or knowing that my partner is going to choose Alpha.

我们发现了α是我们对手的优势策略,所以我们必须要根据,我对手会选α来做出选择

耶鲁公开课 - 博弈论课程节选

I think that at least for many of us, there is a sort of logical conundrum we go through and that is, if good people don't vote then we'll be in a bad world; so I have to vote to prove that good people vote, then maybe it will happen.

我想,至少对大部分人来说,必须面对一个逻辑上的难题,就是,如果好人不投票,那我们将会生活在坏人操纵的世界里,所以我必须要投票,来证明好人会投票,那未来的国家将会由好人掌控

耶鲁公开课 - 金融市场课程节选

In my in my area of research, it's common for us to want to process about 100 images a second in order to get real time display. Each image has about a million elements in it. I 've got to process about a half a gig of data a second in order to get anything out of it.

在我们的研究领域内，我们经常要在一秒钟内处理大概,100张图片以获得实时显示,每个图片大概包括了100万像素,因此我必须在1秒内,处理半个G的数据,来获取我想要的。

麻省理工公开课 - 计算机科学及编程导论课程节选