Typical data mining approaches look for patterns in a single relation of a database.

传统的数据挖掘算法是在数据库的一张单一的表中查找模式。

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From single relation to multiple relations, it becomes a great step for data mining approaches.

从挖掘单一关系到挖掘多关系，数据挖掘技术实现了研讨方式的巨大飞跃。

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The classical data mining approaches can only look for patterns in single relation, and it is difficult to look for complex relational patterns which involved in multi-relational databases.

传统的数据挖掘方法只能从单一关系中进行模式发现，而很难在复杂的结构化数据中发现复杂的关系模式。

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