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 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

The eBay Green Team is an informal group that has worked on everything from eliminating Styrofoam cups in the cafeteria (a project my own team of environmentally active students is trying to accomplish at Yale SOM) to pushing for green buildings.

FORBES: The Employee Push For CSR

The White House has a weekly conference call with an informal group of Catholic advisers, and the Republican National Committee has revived a Catholic task-force.

ECONOMIST: George Bush is redefining the religious right