开销（overhead）任务，如数据库设置和用户界面设计，需要不少的技巧集。
Overhead tasks such as database setup and user interface design require no small set of skills.
挖掘事务库中的频繁项集是数据挖掘的重要任务之一。
The mining of frequent items in transactional database is an important task of data mining.
数据挖掘的一个重要的任务就是发现数据库中的关联规则，也就是发现数据库中项集之间有价值的规则或联系。
Discovering association rules is one of the most important tasks of data mining, that is, to find interesting associations or correlation relationships among a large set of data items.
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