例如，可以用它确定参与碳交易项目的农户采取的固碳措施的有效性。

For example, it could be used to determine the effectiveness of carbon sequestration efforts among farmers participating in carbon trading programs.

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关联规则的主要研究对象是交易数据库，其主要目标就是发现交易数据库中交易项目之间是否存在某些关联关系。

Its main research object is the transaction database, its essential target is to discover whether there is certain connection relation between items in transaction database.

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随后的6个月，Groupon相继进驻波士顿、纽约和华盛顿，每一个城市都提供了一个网页，放置了该城市当日的交易项目。

In the next six months Groupon opened in Boston, New York and Washington, D.C., giving each city a Web page featuring its deal of the day.

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