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.

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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.

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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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