According to the three principles of the image design in Zhaoqing Tourist Zone, its image design system is composed of four tourism senses and five kinds of unforgettable things.
依据肇庆旅游区形象设计的三条原则，肇庆旅游区形象定位设计体系由四种旅游感受、五种难忘事物组成。
The applications of four buses controlling mode to fire fighting system, the design methods and operating principles of four buses fire autoalarm controllers are mainly expounded.
本文重点阐述了四总线控制方式在消防系统中的应用及四总线火灾自动报警控制器的设计方法及工作原理。
Part Three illustrates the educational system and practice from four aspects: running principles, organization system, teaching system and school spirit construction.
第三部分：从办学原则、组织系统、教学制度、校风建设四个方面分析归纳了抗大的教育制度与实施情况。
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