鹿特丹出众的地下运输系统为我们的第三轮测试提供了合适的场地。
Rotterdam does have a nice underground system which was perfect for our third test.
地下洞室群的交通运输系统是一种典型的离散事件动态系统，难以用解析方法计算的数学模型来描述。
The traffic transportation system of underground structure group is a kind of typical discrete event dynamic system, which is difficult to describe with analytic mathematic models.
城市高速铁路交通：一种城市乘客运输系统，使用地下铁路或空中列车，或两者结合使用。
An urban passenger transportation system using elevated or underground trains or a combination of both.
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