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You might not have as many close friends as you think. Researchers have provided new evidence that lends weight to a theory that says you can only maintain five close friendships. 你的亲密朋友也许没有你想的那么多。研究员提供的新证据强调了一种观点，你只能维护好与5个人的亲密友谊。 You’ve probably heard of Dunbar’s Number which suggests that human beings can only maintain meaningful relationships with between 100 to 230 other people, and that number is typically 150. 你可能听说过邓巴数，它指出人只能与其他100~230个人维持有意义的人际关系，而且这个数字通常是150。 | 
