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.
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.
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.
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.
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