translation.en: Because now, with this idea we can take a random sample of people, have them nominate their friends, those friends would be more central, and we could do this without having to map the network.
translation.zh: 因为，有了这个概念， 我们就选择一个随机人群， 让他们提供他们的朋友， 他们的朋友就更加中心， 这样我们就能选择网络的中心，而不用描绘整个网络。