translation.en: And then, to have to deal with large groups, say, at the nation-state level, and we had to have mutual non-aggression, or through a series of conflicts, we eventually came to a rough international bargain to largely keep the peace.
translation.zh: 再后来，为了对付更大的社会群体， 比如说国家之间， 人们就必须制定互不侵犯协定， 或者在经历了一系列的冲突之后，最终达成 一个简要的国际合约来维护基本的和平。