In one condition you're the only person around.

情景一是你单独一人。

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

Everyone knows from calculus that if you're trying to find a function about which you know only the derivative, you can always add a constant to one person's answer without changing anything.

学过微积分的人都知道,如果你想根据已知的导数,求出其原函数,你总是可以给某人的答案,随便加一个常数,且不影响结果

耶鲁公开课 - 基础物理课程节选

So if we go to the ground state, what you see is we're at that lowest energy level, and we only have one possibility for an orbital, because when n equals 1, that's all we can do.

如果我们在基态上，你可以看到，我们在能量最低的态上，只有一种，可能的轨道，因为n等于1，只有这种可能。

麻省理工公开课 - 化学原理课程节选

If you're looking for a beautiful girl, this is one that not only shows you the pictures but it's got a Flash application that you can browse through as well.

如果你寻找美女，页面上,不仅会出现照片,还有Flash应用能帮助你轻松浏览。

斯坦福公开课 - 百度CEO李彦宏演讲：全球最大搜索引擎的发展课程节选