The underground system is also known as the Tube, due to the characteristic shape of the subway tunnels.
地铁系统因其地铁隧道的典型形状也被称为地下管道。
1870 - Tower Subway, the world's first underground tube railway, opens in London.
1870年的今天，世界上第一条地下铁路——塔地铁在伦敦开通。
1870 - Tower Subway, the world's first underground tube railway, opens in London.
1870年的今天，世界上第一条地下铁路——塔地铁在伦敦开通。
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