four-layer structure 四层结构
four-layer system structure 四层体系结构
four-layer security structure 四层安全体系结构
four layer steel structure platform 四层钢结构平台
four-layer security system structure 四层安全体系结构
Based on the ideas of base state with amendments, the temporal layer of raster is designs by four relational tables, and the structure of tables is also given.
基于基态修正思想，设计栅格时态层由四张关系表组成，并设计其表结构。
The tolerancing process and its characteristics were studied based on the product conceptual structure design automation technology. A four layer product tolerance model was put forward.
在产品概念结构设计自动化技术基础上，研究了产品公差设计过程及其特点，提出了四层产品公差结构模型。
Because some problems are in the product knowledge representation, so gives the four layers to solve it, which contains the structure layer, behavior layer, basic-function layer and meta-function lay.
文中从产品知识表达存在的问题出发，提出了基于本体的产品知识表达四层模型，即结构层—行为层—基本功能层—元功能层，给出了各层本体的表示模式。
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