查看业务对象和服务接口。

Review business objects and the service interface.

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zip包含预定义的库项目，包括业务对象和服务接口。

ContactLib.zip contains the predefined library project, including the business objects and service interfaces.

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域为业务对象提供服务检索和维护、封装业务逻辑、定位以及与对象和服务相关联的格式。

The domain offers retrieval and maintenance services for the business object, encapsulating business logic, location, and the format associated with its objects and services.

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