There exist some informal groups in library.

图书馆存在着一些非正式群体。

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Therefore, the informal groups, just like formal groups are the main participants faced by the educators.

因此，非正式群体如同正式群体一样，都是教育工作者的面临的教育主体。

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Informal groups become smaller; attendance drops off in little organizations, and the organizations themselves wither.

私下的圈子变得更小了，小的组织参加的人数在变少，而这些小组织自己也在消失。

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Both Mr Khakulov and Mr Azizkhojaev belong to influential clans, informal regional groups centred on powerful families.

ECONOMIST: Central Asia

In preparation of the main topics of MINEPS V, three informal working groups have been established for the three Conference topics, in order to ensure the consideration of state of the art research and the involvement of competent experts.

UNESCO: Social and Human Sciences

Participants said they hoped informal talks between opposition groups Monday would pave the way for an agreement later in the week.

CNN: Annan says Syrian crisis can't 'drag on indefinitely'