关于为什么进屋之前应该脱鞋，我可以提供几个很好的理由。

I can give you several good reasons why people should remove their shoes before going inside their homes.

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但我们为什么不能暂且坚持我们可以从中学到的东西呢？

But for now why don't we just stick with what we can learn from it?

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天灯为什么可以飞到天上去？

How can sky lantern fly high up in the sky?

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We will always have r equals zero in these radial probability distribution graphs, and we can think about why that is.

在这些径向概率分布图里,总有ｒ等于０处，我们可以考虑为什么会这样。

麻省理工公开课 - 化学原理课程节选

So obvious and so easy to be quench't And not as feeling through all parts diffus'd That she might look at will through every pore?

如此显露，如此易受损伤,为什么不像触觉，分布在全身各部,可以通过每一根毛细管去自由观看？

耶鲁公开课 - 弥尔顿课程节选

Why does agreement to a certain procedure, even a fair procedure, justify whatever result flows from the operation of that procedure?

为什么只要经过了特定程序，公平的程序，不管任何结果都可以视为正当呢？

耶鲁公开课 - 公正课程节选