模板声明是一系列参数化的类或函数的定义集。
The template declaration specifies a set of parameterized classes or functions.
模板声明一个或多个字段，它们一起构成实例的持久化标识。
The stereotype declares one or more fields, which together form the persistent identity of an instance.
数据库特性简化了先前必须进行的一些模板声明。
The database attributes simplify some of the template declarations that you previously had to do.
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