The power of this layer is in separating data access code from the business logic for disparate data store technologies.
该层的作用在于针对不同的数据存储技术，从业务逻辑中分离数据访问代码。
The Resource access layer, which contains the logic necessary to access data.
资源访问层，包含了访问数据所必需的逻辑。
Business rules are centralized into the business logic layer that serves as an intermediary for data exchange between the presentation layer and the data access layer.
业务规则可以集中到业务逻辑层，该层充当表示层和数据访问层之间的数据交换的中间层。
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