It's very exciting, but if you think you know everything you don't need to learn, you don't belong to us. I always need to learn.

这很令人兴奋，但如果你认为,你什么知道，你不需要学习了，那么请你退出百度，因为人总是在学习。

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

If you knew you had a year left or two years left, ? what would you do with that time?

如果你知道自己还剩一年或者两年，这段时间你会怎么利用？

耶鲁公开课 - 死亡课程节选

And so if you know what patterns of zeroes and ones to look for as you will yourselves this year in that forensics problem set, can you recover a lot of that data?

如果你知道如何去发现,这些0和1的排列规则,这也是套题中的问题，你就能恢复把这些大量数据恢复？

哈佛公开课 - 计算机科学课程节选

If you have, if you know you have a conflict with one of those quiz dates now John please see John or I right away.

如果你有事，如果你现在就知道,你有事和这两天冲突了,请马上来见我和。

麻省理工公开课 - 计算机科学及编程导论课程节选

And then, just so that you will be literate in the rest of the Periodic Table, if you look at the higher ones, this is how you name them.

然后，你对周期表的,其他方面也都知道了，如果你观察高一点的元素，这是你们叫它们的方式。

麻省理工公开课 - 固态化学导论课程节选

If you go onto study immunology you'll learn that this is one of the most important and rapidly evolving areas of the study of immunology.

如果你要继续学习免疫学的话,你就会知道这是免疫学中,最为重要而且高速发展的一个研究领域

耶鲁公开课 - 生物医学工程探索课程节选

For example, if you're talking about the chalk--if I throw the chalk, you will have to know where it is and how fast it's moving.

比如说,这支粉笔,如果我扔出这支粉笔,你就像知道它的位置和速度

耶鲁公开课 - 基础物理课程节选

If you know it' s going to work, it's not an experiment.

如果在做实验时,你已经知道这个成分会起作用，那这就不是一个真正意义上的实验了。

普林斯顿公开课 - 领导能力简介课程节选

If you think about what ancient food gathering habits used to be like, you see things like this where people are out gathering food that is growing naturally, and you can think about what would-- what sort of conditions this would create and what kind of hardships it would create.

如果你想知道古代食物采集的习惯,请看这张图,人类都在野外采集自然生长的食物,你可以设想到,条件有多恶劣,生存有多艰难

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If you know the second derivative of y to be a, then the answer looks like this.

如果你知道y的二阶导数是a,那么这就是答案

耶鲁公开课 - 基础物理课程节选