Why don't you stay at the library?

你为什么不呆在图书馆呢？

youdao

youdao

Why did you wave at him?

你为什么向他招手？

《牛津词典》

"People can look at things and be curious about them, but if you are an explorer you want to know why and how and maybe develop an experiment to test the hypothesis."

VOA: standard.2010.06.21

On Thursday, we'll look at why that allows you to do lots of things more conveniently than you can do without mutation.

周四我们会探讨下,为什么这种可变性会让你,在进行很多操作的时候方便了许多。

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We're prevented from rushing to the end of the sentence, or to the end of the poem, because at least as far as the -- well, you can understand why.

想直接读到句末，到,诗的结尾，因为--你们知道为什么。

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And when you look at it, you can see why.

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The better you are at knowing and communicating what needs to be done and why, the more you will excel at the tasks to get there.

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That's why you run for office, or at least why I did.

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