您可以与所有三种类型的服务描述实体交互，在查询中使用它们，应用服务标注，以及建立它们之间的往来关系。
You can interact with all three types of service description entities, using them in queries, applying service annotations, and establishing relationships from and to them.
建立到数据存储的连接、查找标注为实体的所有类、配置持久化逻辑以将这些类绑定到数据存储中的实体，整个过程不可能快速完成。
Setting up connectivity to a data store, finding all classes annotated as entities, and configuring the persistence logic to bind these classes to entities in the data store is not a quick operation.
相反，对象将其他实体声明为成员，并添加标注来定义关系。
Instead, objects declare other entities as members and annotations are added to define the relationship.
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