求翻译：考虑到城市轨道交通安全风险因素的状态在不断变化，本文将梯形模糊数理论、最小平方法、主成分分析法和熵权法等理论与方法相结合，建立了基于梯形模糊数理论的城市轨道交通安全综合风险评估模型。该模型可以对整个评估对象、单个指标分别进行安全评估，判断其所处的风险水平状态，为制定相应有效的控制措施提供参考依据。是什么意思？

Taking into account the urban rail transit security risks in changing the status , the paper will trapezoid fuzzy number theory , least squares , principal component analysis and entropy method of combining theory and methods established based on the theory of fuzzy number of urban rail

Taking into account the urban rail transportation security risk factors of the State in a changing, this document will be trapezoidal fuzzy number theory, the least squares method, the main ingredient analysis and entropy to the theory and methods to create a ladder based on fuzzy theory of the urba

Considered the city track traffic safety risk factor the condition is changing unceasingly, this article theories and the method and so on trapezoidal fuzzy number theory, least squares law, principal components analytic method and entropy power law unified, has established based on the trapezoidal

Considering urban rail transit security risk factors in changing this trapezoidal fuzzy number theory, the method of least squares, principal components analysis combined with the theory and method of entropy-right method is established based on trapezoidal fuzzy number theory for integrated risk as

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