视频对白:

In a very real sense humans are not native to the Earth.
说起来人类根本不是源自地球。

be native to
原属于；源于

1. Americans were urged to forget Europe, to be native authors.
他们要美国人忘记欧洲，作本乡本土的作家。

2. What other factors, apart from native ability, enter into presidential performance would be difficult to say.
除了天赋的能力，还有什么别的因素是执行总统职务所需要的就很难说了。