If you go back in time about [75,000] to 100,000 years ago, let's look at human evolution, it turns out that something very important happened around 75,000 years ago.
让我们回到七万五千年至十万年前时， 我们来观测下人类进化的过程，结果发现 于七万五千年前左右，一件重大事件影响了人类的发展。