And homework, it varies between classes. Sometimes you only get one assignment,

家庭作业，也跟课程的不同而有所差异。
有时候你只有一个作业，

很好奇住宿生活 - SpeakingMax英语口语达人

If you're a dealer, you've got to keep your bid-ask at market; otherwise, you'll get only one side or the other, right?

如果你是中间商,你的出价必须与市场一致,否则就只能拆东补西

耶鲁公开课 - 金融市场课程节选

Now, what happens is half of the participants in the experiment who have listened to each of these tapes-- You only get to listen to one tape.

这时，发生了一件事儿,他们要求半数的受访者,听过这些磁带的人-,只能听磁带。

耶鲁公开课 - 心理学导论课程节选

And once you get out, you can only... you're committed to doing one or the other.

一旦你学完了，你只能……你只能做一个或者另一个，

美国式对比英国式 - SpeakingMax英语口语达人

If you start with only one, you have two pieces of DNA, then you'll get 2 to the Nth fragments after N cycles because each cycle you're doubling the number.

如果你从仅仅一个DNA开始,你有两条DNA链,经过N次循环后,就得到二的N次方个DNA片段,因为每次循环都使其数量翻倍

耶鲁公开课 - 生物医学工程探索课程节选