A person comes out, they live for a thousand years doing whatever they do, and then, when it's time to go back for a billion years -- or a million, I forget, the numbers don't matter -- but there really aren't very many people on Earth at a time.
一个人出来活个一千年 做他们自己的事情，然后时候到了，就回到里面 放个几10亿年--或是几百万年，我忘记确切数字，反正那不重要-- 但是注意，同时存在在地球上的人数并不多