对煤矿危险与有害因素进行了辨识，由事故致因理论出发找到构成煤矿安全系统的人、机、环境、管理四个要素。
Mine risk factors have been identified, and based on the theory of the accident causing to find the coal mine safety system consists of man, machine, environment, and management.
基于对相应结构和建设要素的探讨，提出了城市公共安全系统优化和完善途径；
The optimization approach of the city public safety system is put forward base on the investigation of corresponding structure and factors.
对于作为交通安全系统三要素中主要因素的驾驶员，提高其应激反应适应性是提高交通安全水平的重要措施。
As the major part of the three basic elements of traffic system, it is an important measure to improve the driver's stress driving fitness.
对于作为交通安全系统三要素中主要因素的驾驶员，提高其应激反应适应性是提高交通安全水平的重要措施。
As the major part of the three basic elements of traffic system, it is an important measure to improve the driver's stress driving fitness.
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