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.

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。

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It is the key to solving environmental problems to adjust man-society relationship on the social system level with the relationship between man and natural environment in consideration.

在考虑人与自然环境关系的同时，从社会制度层面来调整人与社会的关系，是解决环境问题的关键。

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Taking a civil airport as an example, the factors affecting the fly safety in this airport were analyzed according to the system engineering theory of "man-machine-environment-management".

以某一民用机场为例，基于“人-机-环境-管理”的系统工程理论，分析该机场影响飞行安全的各影响因素。

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