蜘蛛为什么是我们的朋友？

Why should spiders be our friends?

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这篇文章主要告诉我们为什么耳朵是我们身体的重要部分。

This article mainly tells us why ears are an important part of our bodies.

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对笑感兴趣的同学，最后一个问题是：“为什么我们不能胳肢自己？”

The final question for anybody interested in laughter is, "Why can't we tickle ourselves?"

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So that would probably be de Broglie's answer for why, in fact, we're not observing the wavelength behavior of material on a day-to-day life.

所以那就可能是德布罗意关于,为什么我们无法再日常生活中,观测到物质的波动行为的答案。

麻省理工公开课 - 化学原理课程节选

But we've just introduced it, so let's go back to the class notes and explain why this is the correct answer.

但是由于我们刚刚开始介绍它，因此让我们回到课堂讲义来解释一下,为什么这个是正确答案。

麻省理工公开课 - 化学原理课程节选

Now why--and here is the question why do we get this nervousness about the relationship between what I know and how I know it arising at this moment?

问题是,为什么那时候我们对,我知道什么和我如何知道的关系如此神经紧张？

耶鲁公开课 - 文学理论导论课程节选