NET框架下的四个层次，即：数据表示层、数据访问层、业务规则层和业务外观层，来完成应用系统的实现。
Finally, the application system is implemented through four layers of. NET framework, such as data presentation, data access, operation rule, and operation appearance.
业务层应该对业务对象进行操作，而不是对与视图相关的特定数据表示进行操作。
The business layer should operate on business objects — not on a particular data representation tied to the view.
进一步来说，RPC包括重要的互操作层，称为外部数据表示(XDR)，它确保当涉及到数据类型时，所有NFS参与者使用相同的语言。
Further, RPC includes an important interoperability layer called external data representation (XDR), which ensures that all NFS participants speak the same language when it comes to data types.
进一步来说，RPC包括重要的互操作层，称为外部数据表示(XDR)，它确保当涉及到数据类型时，所有NFS参与者使用相同的语言。
Further, RPC includes an important interoperability layer called external data representation (XDR), which ensures that all NFS participants speak the same language when it comes to data types.
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