The underlying network architecture can be divided into three layers (Device layer, Transport layer, and Control layer) plus the service layer and will be introduced from bottom to top respectively.

基础网络体系结构可分为三个层次(设备层、传输层和控制层)，其上还有服务层，我们将按照从下向上的顺序分别进行介绍。

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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.

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。

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The government's consultative green paper on London, published on July 29th, meets the desire of most movers and shakers in the capital, as well as most of its inhabitants judging from opinion polls, for a new layer of London government both to represent the city at national level and to help resolve a growing transport crisis.

ECONOMIST: The music of the metropolis