That's about how high an object would have to be orbiting straight up from the equator to constantly remain directly above the exact same spot on the rotating planet Earth.

这大约是一个物体从赤道沿轨道垂直向上运行的高度，这样它就可以一直保持在地球同一地点的正上方。

youdao

What on earth will he get up to next?

他下一步究竟要干什么？

《牛津词典》

Luna 16 landed on the lunar surface (in total darkness, no less), collected moon rocks, packed them up, and returned them to Earth.

“月球16号”降落在月球表面(完全是在黑暗中)，收集了月球岩石，打包，然后带回地球。

youdao

Hopefully it is not too late for us to wake up to make our earth more healthy and beautiful.

VOA: special.2010.04.23

You shall not make yourselves unclean through any swarming thing that moves upon the earth. For I the Lord am He who brought you up from the land of Egypt to be your God: you shall be holy, for I am holy.

你们也不可在地上的爬物,污秽自己，我是把你们从埃及地领出来的耶和华,要作你们的神，所以你们要圣洁，因为我是圣洁的。

耶鲁公开课 - 旧约导论课程节选

I think that his deadpan way of bringing things down to earth when they get a little too highfalutin' involves the skill of a genuine stand-up comic.

我认为他是真的有漫画人物的效果,当他总是面无表情的’,让那些过分骄傲的人回归现实。

耶鲁公开课 - 文学理论导论课程节选

Images from this would have been sent back to Earth for up to 30 days for vital research.

BBC: 1962: First US rocket lands on Moon

This will enable it to detect planets as tiny as four earth masses up to 33 light-years away, and earth-sized planets (if they exist) around the sun's closest neighbours.

ECONOMIST: A roadmap for planet-hunting

The US shuttle Atlantis and its six crewmen are heading back to Earth, wrapping up the craft's 32nd - and probably final - trip into space.

BBC: Atlantis set for 'final' return