translation.en: You've got to be really careful any time someone looks back in prehistory and tries to give you some sort of global answer, because, it being prehistory, you can say whatever the hell you want and get away with it.
translation.zh: 任何时候有人回顾史前并试图给出一些 全球性的答案时，你都应该十分小心， 因为，这是史前， 你说什么都行，然后就把说过的抛在一边。