If you want to spend time with a friend but you need to find out their schedule first,

如果你想要和朋友们一起玩，你首先得看一下他们的日程安排。

When 课堂 - SpeakingMax英语口语达人

Occasionally, you'll find you need to cancel out units, because, of course, you're always doing unit analysis as you solve your problems, and sometimes you'll need to convert joules to kilogram meters square per second squared.

偶然地，你会发现需要消除单位，因为在解题时,经常要做单位分析，所以有时候需要把,焦耳换做,一千克乘以米的平方除以秒的平方。

麻省理工公开课 - 化学原理课程节选

Now remember, we went through before how it's a state function but to calculate it, you'd need to find a reversible path, along which you can figure this out.

请记住，我们不需要知道它是怎样的一个态函数,只计算就可以了，你需要找到一条可逆路径，沿着这条路径就能算得这个结果。

麻省理工公开课 - 热力学与动力学课程节选

In particular, please go to it today, you will find a form there that you need to fill out to register for, or sign up for rather, a recitation.

特别声明，请今天就去看，你会找到需要填写的,一份注册表单，或者是复习课的签到表单。

麻省理工公开课 - 计算机科学及编程导论课程节选

Once you find out what you should do, then you need to stay focused.

一旦确定了目标，就要专注。

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