Twelve-year-old Susan and three of her friends formed a group.
12岁的苏珊和她的三个朋友组成了一个小组。
Dr Christakis and Dr Fowler selected a random group of 319 undergraduates and asked each to nominate up to three friends. Using these names, they collected another group of 425 friends.
克里斯·塔斯基博士和福勒博士随机挑选了319名大学生，要求他们列出不多于三个朋友的名字，然后又用这些名字找到了另外425个朋友。
In a group of six people, there will always be three people that are mutual friends or mutual strangers.
在6个人当中，必有三个人相互间是朋友或相互间不认识。
In a group of six people, there will always be three people that are mutual friends or mutual strangers.
在6个人当中，必有三个人相互间是朋友或相互间不认识。
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