在人们来在一起买卖商品或各种服务的地方，我们就有了许多进行商业操作的集体或是合作团体。
So we have got a number of collectives or groups of co-operatives where people come together barter and trade goods and services.
该联盟与美国石油和天然气工业、商业协会、州立机构、学术团体和国家能源技术实验室建立了合作关系。
The consortium creates a partnership with the U. S. petroleum and natural gas industries and trade associations, state funding agencies, academia, and the National Energy Technology Laboratory.
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