So I haven't done magic, I've given you a really fast way to solve a knapsack problem, but it's still exponential deep down in its heart, in something.

所以我并没有施魔法，我已经告诉了你,一种快速解决背包问题的方法了,但是某些方面它的核心仍然是指数增长的。

麻省理工公开课 - 计算机科学及编程导论课程节选

I'm worried that the fast food might make you sick.

我担心吃快餐会把你身体弄垮。

I'm worried 课堂 - SpeakingMax英语口语达人

I mean, you grew up in an age when computers were blazingly fast, and have tons of memory, so why in the world do you care about efficiency?

我的意思是你们是伴随着,计算机快速发展成长的，计算机都有这么大的内存,那还在乎效率干嘛呢？

麻省理工公开课 - 计算机科学及编程导论课程节选

I want to share some of that with you so you can fast forward and get the understanding that took me much longer to get.

我想和你们分享一下心得,这样你们就能更快地进步,并理解我当初花了很久才理解的东西

耶鲁公开课 - 基础物理课程节选

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 want to know how fast it's moving at a given time, if you want to know the velocity, I just take the derivative of this answer, which is 10-10t.

如果你想知道它在给定时刻的运动有多快,如果你想知道它的速度,我只要对这个式子求导,得到10-10t

耶鲁公开课 - 基础物理课程节选