Why is the population in Poland going down?

为什么波兰的人口在减少？

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Why protect chlorophyll at a time when the tree is breaking it down to salvage as much of it as possible?

在树木将叶绿素分解，以尽可能多地将其回收的时候，为什么我们还要保护叶绿素呢？

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But there are several theories as to why paid-click growth is down.

但关于付费点击增长率下降的原因有几种解释。

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The first step to insight is to ask questions like why do things fall down and not up?

起初的洞察力是问问题,为什么物体坠地而不是上升？

耶鲁公开课 - 心理学导论课程节选

Dynamics then tells you why the object goes up, why the object goes down and why is it pulled down and so on.

而动力学则会告诉你为什么物体向上运动,为什么向下运动,为什么停下来,等等

耶鲁公开课 - 基础物理课程节选

Why don't you write down a second on the corner of your notepad what it is you're going to choose to do with my T.A.'s watching so we can't cheat.

请你们各自在笔记本上写下你们的选择,让助教监督一下,以防你们沟通好了

耶鲁公开课 - 博弈论课程节选

Although she did not indicate why she is stepping down, connections are being drawn between her very public mistake--which put national security at risk--and the unexpected resignation.

FORBES: Magazine Article

That is why getting the debt down to prudent levels is the most important economic challenge of our time.

BBC: UK's debts 'biggest in the world'

With most earnings beating forecasts, why is the stock market down?

FORBES: You Can Get Burned Buying Stocks With Strong Earnings Growth