• 1. Network Abstract Layer: 网络抽象层 | 网络提取层
• 2. network abstract layer unit: 网络抽象层单元

• 1.Peer-to-peer systems are often implemented as an abstract overlay network built at the application layer on top of the native or physical network.
  对等系统常常实现为一个抽象的覆盖网络，构建于原生或物理网络之上的应用程序层上。
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• 2.When devices are emulated, such as virtual network adapters, the emulation provides a layer to abstract away the physical hardware.
  当设备被模拟(比如虚拟网络适配器)时，模拟提供一个抽象层以抽象物理硬件。
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