How many people know that three times a week physical exercise,30 minutes each time has the same effect ? as our most powerful psychiatric drugs?

多少人知道，每周三次,体育锻炼，每次三十分钟，与最强劲的精神药物,有同样的效果？

哈佛公开课 - 幸福课课程节选

Yet in another sense political philosophy is something much different than simply a subfield; it seems to be the oldest and most fundamental part of political science.

但从另一个层面来看,政治哲学,相当不同于仅单纯是次领域的学科;,它似乎是最古老且最基础的,政治科学部份。

耶鲁公开课 - 政治哲学导论课程节选

And our engineers constantly hear from other friends working for other Internet companies in Beijing--they living the most flashiest office spaces in Beijing and their salary is raised three times a year.

公司的工程师总是听到,在其他公司工作的朋友说，他们拥有北京最豪华的办公室,薪水一年涨三次。

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

I was just finding very tunnel vision-like, the smallest elements at that moment in time which means I don't know anything about the other elements other than they are not the smallest and so no matter what with Selection Sort I had to repeat this again and again and again and if you do out the math it's roughly N squared steps in the worst case as well.

我只有一个狭窄的视野，只知道某时刻的最小元素,就意味着我并不知道其他元素的任何情况,只知道它们不是最小的,所以不管怎样，在选择排序中,我就得一遍一遍地重复选择过程,在最坏情况下,大概需要N的平方次比较。

哈佛公开课 - 计算机科学课程节选