translation.en: Whatever its causes, the decline of violence, I think, has profound implications. It should force us to ask not just, why is there war? But also, why is there peace? Not just, what are we doing wrong? But also, what have we been doing right?
translation.zh: 无论是什么原因，暴力的下降 具有深刻的影响。它应该迫使我们不仅要问：“为什么会有 战争？“而且要问”为什么会有和平？“不仅仅是 ”我们做错了什么？“还有”我们做对了什么？“