four-layer system structure 四层体系结构
four layer system structures 四层体系结构
four-layer security system structure 四层安全体系结构
four layer elastic-layered system 四层体系
four layer distributed control system 四级分布式控制系统
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。
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