这样就会以“实体类型”实例或“实体”的形式来组织数据并管理实体之间的关联关系。
This organizes the data in the form of instances of "entity types", or "entities", and the associations between them.
逻辑数据模型定义实体以及实体之间的关系，而不考虑实现平台。
A logical data model defines entities and relationships between entities without consideration of the implementation platform.
业务模型定义了实体和实体之间的关系，并且忽略执行平台。
A business model defines entities and relationships between entities, without consideration of the implementation platform.
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