步的联系。这要追溯到二十世纪六十年代，社会心理学家史坦利米尔格兰姆发现他可以向位于内布拉斯加州或者波士顿的任意一个人发送一封信件，并且让该信件最终到达位于马萨诸塞州的任一目标人物。
It was back in the 1960s that social psychologist Stanley Milgram found that he could send a letter to a random person in Nebraska or Boston and have it reach a random target person in Massachusetts.
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