translation.en: We evolved as a species in the savanna lands of Africa, but then you see humans migrating into new environments, into desert lands, into jungles, into the Ice Age tundra of Siberia -- tough, tough environment -- into the Americas, into Australasia.
translation.zh: 我们作为一种物种 在非洲的草原上演化， 但是然后你看到人类迁徙到一个新的环境-- 进入到沙漠，进入雨林， 进入西伯利亚冻土带-- 艰苦，艰苦的环境中-- 进入美洲，澳洲。