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图书馆存在着一些非正式群体。
There exist some informal groups in library.
youdao
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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.
youdao
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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.
youdao