在一个应用程序中仅有几个地方能够实现性能增益 - 表示层、应用层和存储层。
There are only a few places to implement performance gains in an application – the presentation layer, the application layer, and the storage layer.
表示层保证由一个系统的应用层所发出的信息，另一个系统的应用层可以读懂。
The presentation layer ensures that the information that the application layer of one system sends out is readable by the application layer another system.
OSI/RM将计算机网络将网体系结构划分为应用层、表示层、会话层、传输层、网络层、 数据链路层和 物理层七个层次。
OSI/RM classify the structure of the network into application layer, presentation layer, session layer, transport layer, network layer, data link layer and physical layer.
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