Every aggregation type corresponds to a data structure diagram and an entity relationship model.
每种聚合类型对应一种数据结构图和ER模型。
The final ERD (entity relationship model diagram) and system datum dictionary are given through data sheets normalization during logic design and physical design.
在逻辑设计与物理设计过程中通过数据规范化后得出最终的ER模型图并给出系统数据字典。
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。
If, however, the majority of your data fits better in a highly structured entity-relationship model and is less document-like and more intertwined, then choosing an NXD might not help your situation.
但是，如果大多数数据更适合采用高度结构化的实体-关系模型，数据不太像文档并且关系更复杂，那么选择NXD可能并不合适。
In this paper, we give a temporal er - method - based data model, that is the temporal Entity Relationship model (TER).
本文给出了一个基于E- R方法的时态数据模型，即时态实体-关系(TER)模型。
In this paper, we give a temporal er - method - based data model, that is the temporal Entity Relationship model (TER).
本文给出了一个基于E- R方法的时态数据模型，即时态实体-关系(TER)模型。
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