URT failures are the main factors influencing the safety and reliability of the operation.

城市轨道交通系统的事故故障是影响其运营安全与可靠性的主要因素.

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URT is a big project with high building and operating cost and long financial period.

城市轨道交通是一项建设和运营成本高、财务周期长的巨型工程.

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