It's dangerous to want to get away from earth awhile, to get your feet entirely off the ground.

想要逃离地面一会，让自己的双脚同时离开地面很危险。

耶鲁公开课 - 现代诗歌课程节选

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

It simply means human or more precisely earthling because it comes from the word adamah, which means ground or earth.

它只意味着人，或者更准确地说是地球生物,因为它来自单词adamah，意为土地或地面。

耶鲁公开课 - 旧约导论课程节选