此模型描述系统中的实体及其关系。
It describes the entities in the system and their relationship.
数据模型很快就会变得非常庞大，包含很多实体和关系。
Data models quickly become very large with many entities and relationships.
定义实体之间的关系信息。
元模型相对容易理解；它们与实体关系模型非常相似。
Metamodels are relatively easy to understand; they are similar to an entity-relationship model.
他们觉得婚姻关系是一件他们可以修护的实体。
They come in thinking their relationship is an outside entity that can be fixed.
为什么我需要实体关系？
如何创建一对多关系的许多实体？
价值不是一种实体概念，而是一种关系概念。
本文所述的方法适用于多种复杂的空间实体关系。
This method can be applied in studying different kinds of complex spacial relationship.
获取当前实体或关系类型的所有键成员的列表。
Gets the list of all the key members for the current entity or relationship type.
紧接着，是自然法与实体法的关系。
社会网络是对社会中的实体及其之间的关系进行建模的有力工具。
Social network can be used to model entities and their relationships in the society.
社会不是一个实体，个人处于社会关系之中；
问：我们的标题实在是关于建筑空间和建筑实体结构以及能量之间的关系。
Ask: Our question was actually related to the role played by the structure and energy.
问：我们的标题实在是关于建筑空间和建筑实体结构以及能量之间的关系。
Ask: Our question was actually related to the role played by the structure and energy.
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