The London Underground is a rapid transit system in the United Kingdom，serving a large part of Greater London.
伦敦地铁是英国的一个快速交通运输系统，服务于伦敦的大部分地区。
The underground system is also known as the Tube，due to the charateristic shape of the subway tunnels.
地铁系统因地铁隧道的典型形状也被称为地下管道。
It all started in the mid—1800s. The Tube was the world's first underground train system，with the first section opening in 1863.
伦敦地铁始建于19 世纪中期，是世界上最早的地下铁路系统。它的第一段地铁于1863年开始运营。
Since then it has grown to an underground masterpiece of 12 lines，275 stations，and over 250 miles of rail track，45% of which is underground.
自此，伦敦地铁不断延伸，发展成为一个包括12条线路、275个车站、铁轨总长超过250英里的地铁杰作，其中有45%在地下运行。
It is the fourth largest metro system in the world in terms of route miles. It also has one of the largest numbers of stations.
就路线长度而言，它是世界上第四大地铁系统，也是车站数量最多的地铁系统之一。
As an affordable and easy way to get around London，the Tube remains the first choice for millions of commuters each day，as well as tourists visiting the city on holidays.
作为一个走遍伦敦的经济便捷的途径，伦敦地铁一直是每天数百万通勤者以及在节假日游历伦敦的游客的首选。
The Tube has been an international icon for London.
伦敦地铁已成为伦敦的一个国际标志。
The London Underground celebrated its 150 years of operation in 2013，with various events marking the milestone.
2013 年伦敦举办了各种各样的活动，庆祝地铁运营150周年，纪念这一里程碑。
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