The urban transportation system is not only the source of traffic accidental event but also is the lifeline of emergency guarantee.

城市交通系统既是突发事件发生源，又是突发事件应急保障的生命线。

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In the urban transportation system, value of travel time savings is usually divided into two important sides — resource value of time and behavior value of time.

城市交通运输系统中，时间价值通常被分为两类：资源时间价值和行为时间价值。

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Urban passenger transfer hub is an important part of urban passenger transport system, so its service level will affect the efficiency of urban transportation.

城市客运换乘枢纽是城市客运交通系统中的一个重要组成部分，其服务效率的优劣将直接影响到城市交通的运行效率。

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The city's urban transportation system recently launched the first of up to five hydrogen buses.

VOA: special.2009.09.07

The Madrid bombings reveal just how vulnerable the transportation system of a major urban area can be, and whoever carried out this attack in London certainly learned that lesson well.

NPR: Investigators Cautious on Assessing Blame for Attacks