实体关联模型（Entity-Relationship Model）是将商业领域的公司或组织的资料以逻辑方式呈现，实体关联模型相信实体与关联性是真实世界最自然的资料塑模（Data Model），使用...
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逻辑数据模型中实体之间的关系是通过外键来表示的，外键与引用实体的主键相关联。
Relationships between entities in the logical data model are represented through foreign keys that are associated to the primary keys of the referring entity.
正如Thomas Erl所推荐的，使用公共数据模型，这个能力跟“公共实体”实现能力紧密地关联到了一起。
Just as Thomas Erl recommends using a common data model, this capability is closely related to the "common Entities" Implementation capability.
Code First编程模型通过编写类代码来创建模型，与该类关联的实体则包含在模型当中。
The code First programming model is a way of creating a model by writing the code for the classes whose associated entities are contained by the model.
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