这些模型可能非常详细，显示全部的实体、关系和属性结构，甚至具有粗粒度概念之间的核心关系的更高级的可视化表示。
These models can be very detailed, showing full entity, relationship and attribute structures and can even have higher-level visualization of the core relationships between coarse grained concepts.
在第三阶段，用更具体的关系来修改这些将存在于不同表的实体间的概念。
In the third phase, you modify the concepts with more specific relationships that will exist between entities in the various tables.
对象就是对实际业务概念（例如人员、帐户或汽车）的抽象以及对这些实体之间关系的捕获。
Objects are an abstraction of real world business concepts, such as Person, Account, or Car and the capturing of the relationships among those entities.
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