But someone will ask, since it is so, why the earth to now have not united?

可是有人要问了，既然如此，那为何地球到现在还没有统一呢？

youdao

I mean basically the reason why the earth is spinning is because it was formed spinning.

地球旋转的本质原因是，它是在旋转中形成。

youdao

He also explains why he chose to devote his life to one of the smallest creatures on earth.

他还解释了为什么他选择把他的一身致力于地球上最小的生物之一。

youdao

Plate tectonics is the area of science that explains why the surface of the Earth changes and how those changes cause earthquakes.

VOA: special.2010.01.12

Why should the amount by which you're attracted to the Earth be also a measure of how much you hate acceleration?

为什么物体受地球引力的大小,恰好能衡量物体加速的难易程度呢

耶鲁公开课 - 基础物理课程节选

Can you tell me why I'm sure the Earth has an acceleration?

你能告诉我为什么我确信地球有加速度吗

耶鲁公开课 - 基础物理课程节选

That's why the moon dominates the Earth's tides.

CNN: The sun, the moon and the Titanic

So if the decision to use the short take off version of the jet makes sense, why on earth did the incoming coalition government decide to change the plan?

BBC: Why did coalition government change fighter plane plan?

So given that the UK government, UK households and UK banks are struggling to repay a veritable mountain of debt - more in aggregate than the UK has ever borrowed in its existence - why on earth does the UK public sector look an attractive place to investors for their precious cash?

BBC: Why investors love lending to the UK government