The whole system can be logically classified into four layers: user access layer, bearing layer, operation support layer and application layer.
整个系统从逻辑上可以分为四个层：用户层、接入承载层、支撑管理层和业务应用层。
The system has four layers, including application layer, data operation layer, data wrapping layer, and data source layer.
此原型分为四层，分别为应用层、数据操作层、数据包装层、数据源系统层。
The USAF system has four tiers, and the lowest-altitude layer is the suggestively named tier N/A, which was carved out of tier 1 in prospective recognition of the unique qualities of mini-UAVs.
美国空军系统分为四层，高度最低的一层是建议名称为N/A层，小型无人机的独特性质正是该层区别于第一层的主要标志。
The thesis chooses the four-layers structure as the rudiment of our protocol stack system, which includes physical layer, data link layer, network layer and application layer.
本文选择了四层结构作为协议栈体系结构的雏形，即：物理层、数据链路层、网络层、应用层。
On the base of the analysis on common MIS, it combines the fashion technology and object-oriented theory and does some research and design based on four-layer information system on library.
在分析一般的管理信息系统的基础上，结合当今的流行技术和面向对象思想，进行了一个基于四层结构的图书馆信息系统的研究与设计。
On the base of the analysis on common MIS, it combines the fashion technology and object-oriented theory and does some research and design based on four-layer information system on library.
在分析一般的管理信息系统的基础上，结合当今的流行技术和面向对象思想，进行了一个基于四层结构的图书馆信息系统的研究与设计。
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