The subway network was built 100 years ago when much of New York was still farmland, and has hardly expanded in recent decades.

现行的地铁网络是100前建立的，那会纽约大部分地区还是农田。这个网络近几十年来也几乎没有怎么扩建。

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Police said security around London's subway network will be boosted, while policing at Heathrow, Europe's busiest airport, will be as normal.

警方说伦敦地铁周围的安保力量将会加强，而欧洲最繁忙的希思罗机场的安保配置将一切如常。

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Japan boasts modern subway technology and the subway network is extending in all directions which enrich the commercial space in the city.

日本拥有先进的地铁技术与四通八达的地铁网络，地铁丰富了城市的商业空间。

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The subway network, known as the Tube, will be congested and may break the all-time usage record of 4.31 million passengers set on 2 August 2012.

BBC: Navigating the London 2012 exodus

Down below, the Underground station itself has not been used in any capacity since the 1950s, and has not been part of the working subway network since 1934.

BBC: Reawakening the Underground

London's subway, the world's first underground railway network, first opened in 1863.

NPR: UK Widow Helps Resurrect 'Mind The Gap' Recording