So this is important, it's a little bit subtle, but if you don't really understand this deeply, you'll find yourself getting confused a lot.

但你如果没有挺深刻的理解，这件事的话，你会发现自己在这个问题上很困惑。

麻省理工公开课 - 计算机科学及编程导论课程节选

If you don't move 10 yards in that... if you don't move the 10 yards in your four tries,

如果你不推进十码……如果在那四次机会中你不推进十码，

美式足球 - SpeakingMax英语口语达人

So if you haven't already, just glance at the person next to you, or say hello if you don't know them.

如果你还没有做好，那就看看你旁边的人,如果你不认识他们就跟他们打个招呼。

哈佛公开课 - 计算机科学课程节选

Because you will come to regret it if you don't do it. But we're not going to grade it.

但是我们不会对此计分,因为不计分所以让你们。

麻省理工公开课 - 计算机科学及编程导论课程节选

Now, this is a large class, and if you don't do anything about it, it can be very anonymous.

这是一门大班课程,如果你并不打算和周围人相互介绍的话,也就不会有什么人能够认识你了

耶鲁公开课 - 心理学导论课程节选

If you don't do that, there's a danger you will learn something you don't have to, and we don't want that.

但是如果你不来,你就有可能学到一些不重要的知识,我们当然不希望这样

耶鲁公开课 - 基础物理课程节选

You want to talk about it systematically, but how can you talk about anything systematically if you don't know what it is?

人们总希望系统化地谈一件事，但是你一点都不了解它,怎么能系统化地谈它呢？

耶鲁公开课 - 文学理论导论课程节选

If you don't give me seven hours a week, I don't know what I can do for you.

如果你们一周不学习7个小时，我不知道我能为你们做什么了。

麻省理工公开课 - 固态化学导论课程节选

Put yourself down on the wait list if you don't get into the section you want.

如果你想换个小组,请在等候名录里预约

耶鲁公开课 - 博弈论课程节选

Maybe you'll now believe Hobbes if you don't believe me. So the state of nature, it's a state of insecurity, it's a state of conflict.

如果你不相信我的话，你也不一定相信霍布斯,所以自然状态,是一种不安全的状态，是一种矛盾的状态。

耶鲁公开课 - 政治哲学导论课程节选

If you don' t seek out the conflict, you won' t excel.

缺少冲突和矛盾，就没有办法胜过他人。

普林斯顿公开课 - 领导能力简介课程节选

And he asked them, "What happens if you don't get tenure?

他问他们“如果得不到终身职位会怎样？

哈佛公开课 - 幸福课课程节选

I wanted to introduce it to you so that if you don't haven't heard about this before you might want to read a little bit about this before we get to Chapter 5.

我想给你们介绍一下细胞膜,所以如果你没有,以前没听说过这个的话,也许你在学到第五章之前,要读一点关于这些的文献

耶鲁公开课 - 生物医学工程探索课程节选

And tributary, of course, if you don't believe in souls, if you don't believe in soul's exist, that you certainly can't appear to the existence of souls, the continuative soul, the sameness of soul as the key to personal identity.

还有，必然地，如果你不相信灵魂这回事，如果你不相信它的存在，你肯定无法,进一步相信什么灵魂的延续，无法相信同样的灵魂,是保证人格同一性的关键。

耶鲁公开课 - 死亡课程节选

if you have no discipline, you're not going to listen. If you don't listen, you can't learn

如果你没有纪律，你就不会认真听教练的话。如果你不认真听，就学不会了。

布朗克斯的足球教练 - SpeakingMax英语口语达人

And so, if you don't do anything to open those muscles up and strengthen your...

所以，如果你不做什么把这些肌肉打开，并且加强你的……

健康生活 - SpeakingMax英语口语达人