社群的进化How Many Friends Does One Person Need?（前言1）

<p style="color:#333333;font-weight:normal;font-size:16px;line-height:30px;font-family:Helvetica,Arial,sans-serif;hyphens:auto;text-align:justify;" data-flag="normal">社群的进化How Many Friends Does One Person Need?</p><p style="font-size:16px;line-height:30px;font-family:Helvetica, Arial, sans-serif;color:#333333;font-weight:normal;text-align:justify;" data-flag="normal">（英）罗宾&middot;邓巴 著</p><p style="font-size:16px;line-height:30px;font-family:Helvetica, Arial, sans-serif;color:#333333;font-weight:normal;text-align:justify;" data-flag="normal">&nbsp; &nbsp;李慧中 译<br /></p><span><br /></span>