This issue really highlights the difference between a database-style, entity-relationship (ER) worldview and an object-oriented (OO) worldview.

这个问题实际强调了数据库样式的实体关系（ER）世界观和面向对象（OO）世界观之间的不同。

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This database system is developed on the based of relation model, and has been developed with the Object Oriented (OO) method.

该数据库系统的开发工作是基于关系模型，并用面向对象的方法进行了扩展。

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