【Lex Fridman文稿】大卫·基平：外星文明与宜居世界｜英文（Part1）
[链接] David 00:00 I think it's actually not that hard to imagine we are the only civilization in the galaxy right now. Yeah, that's current extent. But there may be very many extinct civilizations. If each civilization has a typical lifetime comparable to,...【查看原文】
