This is where all business rules are applied as data passes from the Presentation Layer (UI), through the business Layer to the data Access Layer, and back again.
当数据从表示层(ui)传递过来的时候，全部的业务规则都在这里执行，通过业务层到数据访问层，然后再倒过来。
With a thin client, you can maximize the one resource you have complete control over, the server, to do the brunt of the work and dish out a minimal set of data and presentation layer information.
有了瘦客户机，您就可以最大限度地利用您能完全控制的资源（即服务器），由它去完成繁重的工作，而只提供精简的数据集和表示层信息。
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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