从某种意义上说，因为抚养孩子是社会首先存在的原因。这是发生的最重要的事情，是进化的所有工具，语言和社会结构的高潮。
(Because raising children is, in a sense, the reason the society exists in the first place. It's the most important thing that happens, and it's the culmination of all the tools and language and social structure that has evolved.)