The first line was the partially underground Metropolitan Railway line which opened in 1863, and is now a part of the more expansive London underground system.

开通于1863年的伦敦市地下铁路是伦敦地铁的前身。这一段开通于那个年代的地铁已经成为了正在日益扩张的伦敦地铁系统的一部分。

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Universal Pictures also said that the posters were not placed near schools and appeared in the London Underground system, which does not have a high proportion of children.

此外，"环球影业"称，宣传海报并没有在学校附近出现，而是投放在儿童很少出现的伦敦地铁里。

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And in London they deployed sensors to monitor displacement, temperature and humidity in a tunnel on the Jubilee Line of the Underground rail system.

在伦敦，他们在地下铁路系统的朱比里线中的一条隧道布置了传感器，用以监测隧道内的排水量，温度和湿度。

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London may be famous for its red double-decker buses, but it is the underground system, parts of it more than a hundred years old, that is especially vulnerable.

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On July 7, 2005, al Qaeda suicide bombers killed dozens on the London underground system.

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All three bombs on the London Underground system exploded within 50 seconds of each other at around 0850 on Thursday.

BBC: NEWS | UK | London bombings: Police updates

What's been so interesting here in the UK is this time around - unlike after the July the 7th bombings on the London underground system - everyone universally and rightly has condemned this barbaric act.

NPR: Violence In Europe Leaves People Fearful