你有多少个真正的朋友?
<p><span word="Many">Many</span> <span word="of">of</span> <span word="us">us</span> <span word="may">may</span> <span word="have">have</span> <span word="lists">lists</span> <span word="of">of</span> <span word="contacts">contacts</span> <span word="and">and</span> <span word="followers">followers</span> <span word="on">on</span> <span word="social">social</span> <span word="media">media</span> <span word="networks">networks</span> <span word="that">that</span> <span word="extend">extend</span> <span word="into">into</span> <span word="the">the</span> <span word="thousands">thousands</span>, <span word="but">but</span> <span word="new">new</span> <span word="research">research</span> <span word="has">has</span> <span word="found">found</span> <span word="we">we</span> <span word="may">may</span> <span word="actually">actually</span> <span word="only">only</span> <span word="have">have</span> <span word="five">five</span> <span word="real">real</span> <span word="friends">friends</span>.</p><p>我们中的许多人通讯录里的联系人和社交媒体网络上的好友可以增加到数千人，但是新研究指出，事实上我们拥有的真正意义上的朋友可能只有5个。</p><p><span word="A">A</span> <span word="team">team</span> <span word="of">of</span> <span word="scientists">scientists</span> <span word="have">have</span> <span word="found">found</span> <span word="that">that</span> <span word="while">while</span> <span word="humans">humans</span> <span word="have">have</span> <span word="the">the</span> <span word="capacity">capacity</span> <span word="to">to</span> <span word="form">form</span> <span word="complex">complex</span> <span word="layered">layered</span> <span word="societies">societies</span>, <span word="we">we</span> <span word="face">face</span> <span word="an">an</span> <span word="upper">upper</span> <span word="limit">limit</span> <span word="to">to</span> <span word="how">how</span> <span word="many">many</span> <span word="friends">friends</span> <span word="we">we</span> <span word="can">can</span> <span word="have">have</span> <span word="in">in</span> <span word="our">our</span> <span word="inner">inner</span> <span word="circle">circle</span>.</p><p>一个科学家团队发现，人们可以构建纷繁复杂、层次分明的社会群体，而在自己的社交圈里，我们拥有的朋友数量是有上限的。</p><p><span word="They">They</span> <span word="say">say</span> <span word="this">this</span> <span word="upper">upper</span> <span word="limit">limit</span> <span word="of">of</span> <span word="five">five</span> <span word="has">has</span> <span word="likely">likely</span> <span word="gone">gone</span> <span word="unchanged">unchanged</span> <span word="for">for</span> <span word="hundreds">hundreds</span> <span word="of">of</span> <span word="thousands">thousands</span> <span word="of">of</span> <span word="years">years</span> <span word="and">and</span> <span word="probably">probably</span> <span word="governed">governed</span> <span word="social">social</span> <span word="relationships">relationships</span> <span word="when">when</span> <span word="humans">humans</span> <span word="lived">lived</span> <span word="as">as</span> <span word="groups">groups</span> <span word="of">of</span> <span word="hunters">hunters</span>.</p><p>他们表示，几十万年来，5个朋友的上限可能从未改变，或许从人类集体狩猎开始，这种模式一直掌控着人际关系。</p>
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