The class is the basic management and education unit in the school, it is also the most important social organization for the student's school life. The informal group commonly exists in the class.

班级是学校中基本的教育单位与管理单位，也是学生在学校生活中最重要的社会组织。

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These associations are informal clubs of friends and other trusted members of the ethnic group who make regular contributions to a fund.

这些协会都是一些非正式的俱乐部，由朋友和其他值得信赖的少数民族成员组成，他们定期向基金捐款。

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Meanwhile, remittances from abroad, self-employment, tourism, foreign investment and the informal economy have lifted the incomes of a large group of Cubans.

同时，海外侨汇、自营商、观光业、外国投资和非正式经济已经提高了大群古巴人的收入。

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The group advocating for ending the one-child policy thought the change "would be a simple matter, " said Gu Baochang, a professor of demography at Renmin University in Beijing, former adviser to the Family Planning Commission and informal leader of the advocacy group.

WSJ: China's One-Child Plan Faces New Fire

The attack was claimed by a mysterious group, the Informal Anarchist Federation (FAI), which had previously confined itself to dispatching parcel bombs.

ECONOMIST: Italian politics

The restructuring, done under the auspices of the Paris Club, an informal group of western creditor countries, came earlier than expected and just in time for the first round of Iraqi elections expected in January.

ECONOMIST: Iraq's debts