此外，展示层可以透过服务(例如，服务)与中介层内的资料存取逻辑进行通讯。
Additionally, the presentation layer might communicate with the data access logic in the middle tier through a service such as a service.
这么做可以对资料存取和资料实体层进行逻辑划分。
This enables logical separation of the data access and data entity tiers.
确定了该子系统的主要功能，并设计了子系统的软件架构、业务逻辑层以及数据存取层。
The major functions of the subsystem are determined and the software frame, service logic layer and data access layer of the subsystem are designed.
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