图书馆存在着一些非正式群体。
非正式群体是同伴关系的一种重要形式。
The unofficial colony is a kind of important form of companion's relation.
大学生网络虚拟群体是以电脑网络为沟通、联系平台建立的非正式群体。
Online virtual communities among college Students are informal groups who hold the computer network as the platform for communication and association.
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