If we do spring from a common source, how did we come to occupy every corner of the globe, and in the process generate all of this diversity, the different ways of life, the different appearances, the different languages around the world?
那就是如果我们都是从一个起点来的， 又是怎样散布到世界的各个角落， 怎样一步步产生不同的人种， 不同的生活方式，不同的样貌， 不同的语言的呢？