The paper discusses the research on collaborative design, engineering database theories and collaborative environments of engine CAD, introduces the backstage dbms-oracle particularly.
本文对协同设计、工程数据库等相关理论作了深入的研究，并对发动机工程CAD的工作环境，后台数据库管理系统ORACLE作了详细的阐述。
Again standard design theories according to the database carry on the concept structure and logic structure of database a design.
再依据数据库标准设计理论，进行数据库的概念结构和逻辑结构设计。
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