You take all the risky assets ... and you analyze them first to get their-- you have to do a statistical analysis to get their expected returns, their variances, and their covariances.

你需要对所有的风险资产进行分析,首先要得到它们的-,你必须要做一个统计分析,算出它们的预期收益率，方差，和它们的协方差。

耶鲁公开课 - 金融市场课程节选

The challenges that... First of all, you got to understand that learning a language takes time.

挑战就是，首先，你必须明白学习一门语言是件耗时间的事。

学第二外语的时候 - SpeakingMax英语口语达人

Well, I think the first thing is like you really have to want to learn it.

嗯，我觉得首先是你真的必须想学。

学习外语的时候 - SpeakingMax英语口语达人

Best way to lose weight? Well, first of all, you must be active.

减肥最好的办法？嗯，首先，你必须积极主动。

要拥有好身材 - SpeakingMax英语口语达人

You've got to be able to make this stuff and you've got to be able to make it in large quantities and we'll talk about how to make nucleic acids in large quantities a little bit later in the lecture.

首先你必须能够合成这种分子,合成出的分子数量必须足够多,我们待会儿会讲到,如何大量合成核酸分子

耶鲁公开课 - 生物医学工程探索课程节选

Because,indeed,they don't exist They're merely possible And we might say,you've got to exist in order for something to be bad for you But once we say that it seems we're running towards the position that in that case,death can't be bad for me because of course,when I'm dead,I don't exist ? So how can anything be bad for me?

因为他们其实并不存在,他们只是一种可能,我们由此认为你必须首先存在,某事才会让你害怕,但我们一旦这么说,我们似乎会得出这个结论,这种情况下死亡不可能让我害怕,因为我死了就不存在了,所以我怎么会害怕？

耶鲁公开课 - 死亡课程节选

Yeah, I think so. I think you have to register.

是的，我想是的。我认为，首先你必须去注册。

关于创业的全部 - SpeakingMax英语口语达人