Put forward the concepts involved in the data model of the object in a logical environment, whose essentials are object and relationship.

提出在逻辑环境下对象的数据模型应涉及到的概念，其基本概念是对象和联系。

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Put forward the concepts involved in the data model of the object in a logical environment, whose essentials are object and relationship.

提出在逻辑环境下对象的数据模型应涉及到的概念，其基本概念是对象和联系。

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