we have come a long way since our ancestors first stood up on the african savannah more than a hundred thousand years ago.
自从我们的祖先10万多年前第一次踏上非洲的热带稀树草原,我们已经走了很长一段历程。
and they earned it perhaps a hundred thousand years ago or more or well more than that.
那些灵魂或许在数万年前或是更久以前已经获得了提升。
the last major event began around a hundred thousand years ago, with a gradual cooling that lasted for tens of millennia.
最后一次重大事件发生大约发生在十万年前,并且伴随着数千年的温度下降。