数据定义利用DBMS可定义数据类型及数据的存贮形式，可保证数据的完整性和一致性。
May define the data type and the data storage form using DBMS, may guarantee the data the integrity and the uniformity.
而对于一个系统来讲，其中央存贮系统是保证整个系统正常工作的关键部件之一。
As a system, its central memory system is one of the units ensuring the normal work of the entire system.
数据库语义学保证数据库所存贮的信患准确地描绘有关的企业。
Database semantics enables all the stored information to describe the related enterprise accurately.
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