translation.en: I spent the last few years trying to answer that question, traveling around, meeting families, talking to scholars, experts ranging from elite peace negotiators to Warren Buffett's bankers to the Green Berets.
translation.zh: 过去几年我一直在寻找这个问题的答案， 去了许多地方，探访了不同家庭，跟学者们交谈， 跟不同领域的专家，包括进行和平谈判的精英， 沃伦·巴菲特的银行家，和绿色贝雷帽 （美国陆军特种部队）