Some scientists have called Jupiter the protector of the inner planets and our own Earth -- from objects from the outer solar system.

VOA: special.2009.08.25

The Earth seems to be a pretty good inertial system, because on the ground, you leave something, it stays there.

地球看上去是个不错的惯性系,因为什么东西放在地上,都会保持静止

耶鲁公开课 - 基础物理课程节选

That made it very beautiful and there's no way in God's earth that we could replicate that to the Western system of musical notation.

那使得它十分美丽,我们却没有任何办法,用西方的乐谱方法,再现这样的音乐

耶鲁公开课 - 聆听音乐课程节选

This balanced system makes it possible for plants, animals and people to survive on Earth.

VOA: special.2010.01.19

He told students it was time for them to learn what it means to be a human being on Earth at a time when every living system was failing.

VOA: special.2009.06.05

After 50 years of silence, I think the time has come to take stock and say, maybe we should mobilize all of the sciences to look for anything fishy, anything weird,any anomaly, both in our own little corner of the universe here on Earth and in the solar system, and far out across the galaxy."

VOA: standard.2010.04.16