操作可以是一个关系运算符，或者系统或用户定义的函数，也可以是一个sql操作符，例如GROUPBY、ORDER BY等。
An operation can be a relational operator, a system - or user-defined function, or an SQL operator, such as GROUP BY, ORDER BY, and so on.
由于这一层关系，它操作起来更像是一个用户定义的关系操作符。
With the correlation it operates more like a user-defined relational operator.
部署描述符中包含的抽象模式定义了实体bean的持久性字段，以及它与其他bean之间的关系。
The abstract schema, part of the deployment descriptor, defines the persistence fields of the entity bean and its relationships with other beans.
对称的操作符，如算术操作符、相等操作符、关系操作符和位操作符，最好定义为普通非成员函数。
Symmetric operators, such as the arithmetic, equality, relational, and bitwise operators, are best defined as ordinary nonmember functions.
标识符与数字流之间的分配关系由一个分配表定义并且能够随时间而变化，由此允许进行动态复用。
The allocation of an identifier to a digital stream is defined by an allocation table and can vary over time, in such a way as to enable dynamic multiplexing.
标识符与数字流之间的分配关系由一个分配表定义并且能够随时间而变化，由此允许进行动态复用。
The allocation of an identifier to a digital stream is defined by an allocation table and can vary over time, in such a way as to enable dynamic multiplexing.
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