translation.en: I have come to think it's one of the most powerful brain systems on Earth for both great joy and great sorrow. And I've also come to think that it's one of three basically different brain systems that evolved from mating and reproduction.
translation.zh: 让人们大喜大悲 所以我认为它是世上最强大的大脑组织 我认为它是从最初的交配和繁殖 发展而来的最基本的三种不同的大脑组织。