an extensive rail network
...lexibility for business）、 全球的商务中心 （ a global business center ）、广泛的轨道交通网（an extensive rail network）、关注城市个性（focus on identity）等内容，这些问题集中在提高城市生活质量..
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an extensive rail network
庞大的铁路网
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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In transportation, China built the largest high-speed rail network, an extensive new highway system, and more new airports than the rest of the world combined (56 more are planned by the end of 2016).
交通方面，中国铺设了最大规模的高铁网络（一种造价昂贵的新型铁路系统），新建的机场也超过了全世界的总和（到2016年底，计划将新建机场56座）。
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The MTA operates New York City's subway and bus system as well as an extensive regional transit network stretching into the suburbs, including the Metro-North and Long Island Rail Roads and the Staten Island Railway.
WSJ: Prendergast Picked to Run MTA