求翻译：以重庆轨道交通1号线为例，通过实地调研和专家打分，获取相关数据，运用已建立的城市轨道交通安全风险评估模型，综合评估了重庆市轨道交通安全风险水平，得出城市轨道交通安全风险等级。评估结果表明重庆市轨道交通风险等级为“3级”，风险处于低水平，其中员工技术水平和安全管理风险等级最高“4级”，处于较低风险水平，乘客素质、设备设施状况和极端天气均处于低风险水平。是什么意思？

Chongqing Rail Transit Line 1 , for example, through field research and expert scoring , access to relevant data , the use of urban rail transit safety risk assessment model has been established , a comprehensive assessment of the Chongqing Rail traffic safety risk levels , obtain urban rail transit

To Chongqing track transportation Line 1 for example, through a combination of field research, and experts, to obtain the relevant data, use the established urban rail transportation security risk assessment model, the comprehensive assessment of the Chongqing city rail transportation security risk

Take the Chongqing track transportation 1 line as the example, through investigates and studies on the spot and the expert grades, the gain correlation data, the utilization has established the city track traffic safety risk assessment model, the overall assessment Chongqing track traffic safety ris

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