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。

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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。

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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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The society was formed by the Friends of The Three Horseshoes (Froth) group.

BBC: Charsfield villagers aim to re-open Three Horseshoes pub

When the subject turned to friendship, King told the group that he had an "unusual situation" because he remains friends with three individuals he's known since the age of 10.

CNN: Larry King: I want to be frozen

On September 21st, prosecutors from Travis County led by Ronnie Earle (as it happens, the only Democrat left with any real power in the state) indicted three friends of Mr DeLay and eight corporations said to have contributed to Texans for a Republican Majority, a group the former pest exterminator founded, on 32 felony charges.

ECONOMIST: A spot of local bother for Tom DeLay