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。
2
What on earth will he get upto next?
他下一步究竟要干什么?
《牛津词典》
3
Luna 16 landed on the lunar surface (in total darkness, no less), collected moon rocks, packed them up, and returned them toEarth.