使用会话Bean作为远程外观使用，对复杂交互进行包装，并减少Portlet和域对象间的远程调用。
Use session beans acting as remote facades to wrap complex interactions and to reduce remote calls between portlets and domain objects.
活动记录模式则可用来在域类内包装关系数据库持久性方法。
You use the active record pattern to wrap relational database persistence methods in domain classes.
子类是域类，因为它们向存在于应用程序域内的实用工具提供了包装程序。
The subclasses are said to be domain classes because they provide wrappers to entities that exist in the application domain.
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