And why are we wasting our time doing this?." Rossman says the risk from serpentine are low.

VOA: standard.2010.07.26

So, again, this is why I'm disclaiming that this isn't all that interesting yet, but what am I doing.

此外，这就是为什么我放弃那个，这个不是那么,有趣，不过我现在在做什么呢？

哈佛公开课 - 计算机科学课程节选

That's why there's a lot of emphasis on sharpening your teeth by doing this class of problems.

这就是为什么强调要通过解决这些问题,来提高你的能力

耶鲁公开课 - 基础物理课程节选

"It should be clear understandable what they are doing, why they are doing it, and what all their decisions are based on.This is one.

VOA: standard.2010.04.15

So, some people might say, why are we doing this?

如果我们把探测器放到旁边的地方？

麻省理工公开课 - 化学原理课程节选

Why are you doing this? I just felt like running.

VOA: standard.other

Now the part about his life in Chicago was I'm going to keep doing this, call it the novel versus the autobiography, and I'll explain why I make that mistake a little later--it was cut from the autobiography.

他在芝加哥的生活那部分,我会一直把这书叫做小说，而不是自传,我之后会解释为什么犯这样的错误,这书是从自传的一部分。

耶鲁公开课 - 1945年后的美国小说课程节选

Why are we doing this? Because there's an important lesson here.

为什么要学这些,因为有个重要结论

耶鲁公开课 - 博弈论课程节选

This is very important,which is why I am doing it: "If we want to know how fast a human being can run, then it is no use to average out the speed of a "good sample" of the population; it is far better to collect Olympic gold medal winners and see how well they can do.

这话非常重要，是我作这个研究的原因：,“如果想知道人类最快能跑多快，那从好的样本中测出平均数是“,没用的;,而应该收集田径类奥运冠军的信息,看他们能跑多快。

哈佛公开课 - 幸福课课程节选