Alfred Wegener said the mountains and fossils were evidence that all the land on Earth was united at some time in the distant past.

VOA: special.2010.01.12

In the universe we-- Who knows what is out there in the universe but at least on Earth we may well be the only people there are.

在宇宙中，我们-,谁知道宇宙中有什么,但至少在地球上我们很可能是唯一的。

耶鲁公开课 - 死亡课程节选

So, when you divide by m, m cancels and everything falls at the same rate on the surface of the Earth.

因此,当等号两边除以 m 时,m 被消去了,在地球表面的所有物体,都以相同的加速度下落

耶鲁公开课 - 基础物理课程节选

At 400 kilometers above the earth, cameras on board the shuttle took pictures of the space station.

VOA: standard.2009.11.30

When not on the slopes, Weibrecht takes classes at Dartmouth College and plans on eventually earning his Bachelor of Arts in earth science.

VOA: standard.2010.02.09