Here's a way that you can do it in a test tube without using any cells by this process called Polymerase Chain Reaction.

但有一个方法可以让你在试管中完成,不用细胞,这个方法叫聚合酶链式反应

耶鲁公开课 - 生物医学工程探索课程节选

So that way you can have an idea if, oh, I do really understand this but I'm a little bit slow, maybe I need to practice this one type of problem a little bit longer so I can get up to speed so I'm going to be able to get through all this in terms of the exam time.

这样你就可以知道，假设，噢，我真的懂这个，但是我的速度有点慢，或许我需要在练习这个类型的题目上,多花一点时间,这样我就可以提高自己的速度,可以全部做完,在考试规定的时间内。

麻省理工公开课 - 化学原理课程节选

Now can any of you think of one way that you do this, which is reconnecting with nature, and in some ways what are some techniques to advise the interviewer?

所以我很好奇你们有没有,类似的经历,和自然重新建立了联系,有没有一些技巧,告诉主持人？

普林斯顿公开课 - 人性课程节选

And my real answer is, go try it out, because obviously you can tell I frequently do this the wrong way and the TAs give me a hard time every time. John.

你可以，而我真正的答案是去试一试吧,因为很明显你可以发现我老是做错,而我的助教总是给我难堪，约翰。

麻省理工公开课 - 计算机科学及编程导论课程节选

You can do that, but we like to get the answer the way this gentleman described it, because we like to get an answer more readily than by doing the mundane work.

你可以那样做,但是我们喜欢,用这位同学所说的方法来得到结果,因为我们喜欢更简洁地获得结果,而不是通过繁琐的计算

耶鲁公开课 - 基础物理课程节选

Odds are if you're an upperclassman, you've had that experience where it's 12 AM, 1 AM, 2 AM, and you're really starting to stress over the incompletion of some problems that for some course, well frankly what this mechanism allows you to do if you're already 90 percent of the way there, you can call it a night and you can put it down and you could feel good nonetheless about where you got to.

对于上游的同学可能觉得无趣，因为他已经具备了这些经验，这时应该开始关注某些课程中,问题的不完整的部分，如果你已经学会了,里面90%的知识，你可以停工,或者把这门课扔到一边。

哈佛公开课 - 计算机科学课程节选

Do you know you can relate to it this way?

你是否也有过类似的经历？

普林斯顿公开课 - 人性课程节选

take the derivative of this, get the velocity vector and you notice his magnitude is a constant Whichever way you do it, you can then rewrite this as v square over r.

对这个式子求一次导,就能得到速度矢量,你会发现其模长是常数,不管用什么方法,加速度也可以写成 v^2 / r

耶鲁公开课 - 基础物理课程节选