"When you put that all together it suggest that we are going to need something like 50 percent more, perhaps 100 percent more, food from our existing land and that is a very significant challenge and we believe we need to be thinking seriously about that right away,"

VOA: standard.2009.10.21

So, when in doubt, if you're having some weird character issue, odds are you need to escape it in some way.

如果你有拿不准的字符,可能就要用到转义字符了。

哈佛公开课 - 计算机科学课程节选

All right. What do you do when you've found the bug and you need to fix it?

好了，当你发现错误并修改它们的时候,你该怎么做？记住一个古老的法则？

麻省理工公开课 - 计算机科学及编程导论课程节选

It turns out that when you're talking about macroscopic properties of matter, you don't need very many variables to describe the system completely thermodynamically.

实际上,当你谈及物质的宏观性质时，你并不需要很多变量才能从热力学上,完整地描述这个系统，’

麻省理工公开课 - 热力学与动力学课程节选

Well, one way of course is to accept the objection and say " "You're right Death isn't really bad for me " And some philosophers have indeed accepted that very conclusion, maybe Epicurus Most of us want to say " "No, no Death is bad for me" So we need a better answer to the ?" "Oh yeah? When is it bad for you?"

一种方式当然是接受它并说,“你是对的，死亡对我来说真的没什么坏处“,而一些哲学家确实接受了,那个结论，也许比如伊壁鸠鲁,我们大多数人想说,“不，不，死亡对我来说有坏处“,于是我们需要一个更好的答案来回答,“是么？，它什么时候对你有坏处了“

耶鲁公开课 - 死亡课程节选

What you need to know is that when m equals 0, 3dz2 it's 3 d z squared.

你们要知道的是,当m等于0时，它是。

麻省理工公开课 - 化学原理课程节选