Infrastructure Layer - physical hardware, network and operating systems.
基础架构层——物理硬件、网络和操作系统。
The whole system was divided into three layer: physical layer, communication link layer and application layer.
把整个系统分为三层：物理层，通信链路层和应用层。
The whole system was divided into three layer: physical layer, communication link layer and application layer.
把整个系统分为三层：物理层，通信链路层和应用层。
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