Compare node B in the upper left to node A in the lower left. Now, those people both have four friends, but A's friends all know each other, and B's friends do not. So the friend of a friend of A's is, back again, a friend of A's, whereas the friend of a friend of B's is not a friend of B's, but is farther away in the network. This is known as transitivity in networks. And, finally, compare nodes C and D: C and D both have six friends. If you talk to them, and you said, "What is your social life like?" they would say, "I've got six friends. That's my social experience." But now we, with a bird's eye view looking at this network, can see that they occupy very different social worlds. And I can cultivate that intuition in you by just asking you: Who would you rather be if a deadly germ was spreading through the network? Would you rather be C or D? You'd rather be D, on the edge of the network. And now who would you rather be if a juicy piece of gossip -- not about you -- was spreading through the network? (Laughter) Now, you would rather be C.
把左上角的点B和左下角的点A做比较。他俩都有四个朋友,但是A的朋友们彼此相知,B的朋友们却不是。所以A的一个朋友的朋友,反过来还是A的朋友,而B的一个朋友的朋友倒不一定是B的朋友,而是在网络中的更远处。这就是网络中的可传递性。最后再来比较点C和点D,两者都有六个朋友,如果你问他们:“你的社交生活怎样?”他们会说:“我有六个朋友。这就是我的社交经历。”但我们来鸟瞰这个网络,我们就会发现他们的社交圈是完全不同的。接下来的这个问题就可以培养你这方面的直觉:如果一种致命的病毒在这个网络里得以扩散, 你希望你是其中的哪一位?你是想当C还是想当D?你当然是想当D,处在网络的边缘。如果一条跟你无关的八卦资讯在这个网络里散播,你又会想当谁呢?这次你会想当C。
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