It's very interesting because velocity seems to require two different times to define it -- the initial time and the final time.

这非常有趣,因为速度似乎需要两个时间才能算出来,初时刻和末时刻

耶鲁公开课 - 基础物理课程节选

You spend time looking for the article and when you find it, there are two different colors.

你花时间找你想要的东西，而当你找到了，有两种不同的颜色。

What do you 课堂 - SpeakingMax英语口语达人

A covalent bond is any time we have a pair of electrons that is shared between two different atoms.

所谓共价键就是我们有两个原子,共用一对电子。

麻省理工公开课 - 化学原理课程节选

Even though you'll see a whole bunch of constructs today and even throughout the course, you will find that there's often multiple ways to implement something, and it will be up to us to guide you toward better design and making in giving two different options the better choice as time passes.

即使今天乃至整个课程中,你们将了解到很多的结构，你将发现,这里有很多的方法来处理一些事情，这将引导你们做更好的设计,随着时间的推移，从两个不同的选择中,选择一个更好的。

哈佛公开课 - 计算机科学课程节选

And so from now on,Shelly Kagan,that single person, is in two different places at the same time.

所以从现在开始，Shelly，Kagan一个人，同时身处两处。

耶鲁公开课 - 死亡课程节选