"The power source for the aircraft are the two battery packs you see on either side, which are lithium ion batteries which are similar to what you find in our laptops, only custom made for us for this application."

VOA: standard.2010.08.11

and he started with the position that you ought to cut taxes but only where you can find offsetting cuts and government spending.

最开始，他的观点是,减税是正道,但必须先想到如何补偿这部分损失,如何削减财政支出。

斯坦福公开课 - 经济学课程节选

But the only way you're going to find out is when you actually deal with the problem.

但是只有你动手去解题,才是验证自己会与不会的唯一方法

耶鲁公开课 - 基础物理课程节选

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

That's the only time you're going to find out.

只有这个时候你才知道自己是否真正理解了

耶鲁公开课 - 基础物理课程节选

You're only given the particle has acceleration a, and you are asked to find out what is x?

你只知道质点的加速度为a,你需要求出x是多少

耶鲁公开课 - 基础物理课程节选