People can't afford them. That's why we don't really have a malaria vaccine yet, because no one in rich countries really suffers from malaria.

VOA: special.2010.03.29

Why? Because no matter how the other firm, your competitor, prices you might have an incentive to undercut them.

为什么,因为不管你对手怎么定价,你总有想削弱他们的动机

耶鲁公开课 - 博弈论课程节选

That's why your operating systems and your personal computers often crash for no apparent reason. Just because two things happen to, once in a while, occur at the same time.

这就是为什么你的电脑或者操作系统,经常会毫无预兆的崩溃了,这是因为两件事情正好同时发生了，通常还有人工输入。

麻省理工公开课 - 计算机科学及编程导论课程节选

Because there's probably no right answer here, but why might this approach be better? Yeah?

因为这里没有一个固定的答案，但是为什么这个方法更好点呢？，你说？

哈佛公开课 - 计算机科学课程节选

In fact, I do this as well, I mean I have water with me and I have no idea why because I'm not particularly dehydrated.

事实上,我也整天带着水壶,我是说我随身带水,但又不知道为什么要带,因为我并没有特别的脱水症状

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

This is the strongest memory I have, and I remembered a) that I didn't learn them, and that was really bad because it kept coming up, but the other thing I remember is that I had no idea why they were important. I didn't really understand what any of these molecules were.

这就是我最深刻的记忆，我记得我并没有学好，这十分不好，因为之后它们总是不断出现,但另外的事情我记得,是我完全没有概念为什么。

麻省理工公开课 - 化学原理课程节选

The general story of why we can't in general is because there's no surprise, there's no mock aggression, and also there may be a general deadening of self-stimulation.

为什么大部分人不能胳肢自己,是因为它在我们意料之内，没有打闹的侵略性，通常这种引自己笑的念头都会嘎然而止。

耶鲁公开课 - 心理学导论课程节选

And here's why. Because this is the No. 1-- equating to selfishness and immorality is the No. 1 cause-- subconsciously mostly, but not only-- No. 1 cause of unhappiness.

这就是为什么，因为这是头号-,将自私等同于不道德是头号原因-,多数是在潜意识里-,导致不快乐的头号原因。

哈佛公开课 - 幸福课课程节选

Why? Because the labor is the unquestionable property of the laborer " and therefore, no one but the laborer can have a right to what is joined to or mixed with his labor.

为什么，因为劳动是劳动者无可争议的所有物,《政府论》第五章，“论财产“,因此除这名劳动者以外,对他施加或掺进劳动的所有物，别人没有所有权。

耶鲁公开课 - 公正课程节选