Beijing is planning to build the world's biggest subway and dramatically expand its bus network as part of efforts to combat the city's fast-increasing traffic grid-lock, state press has said.

国家媒体报道，为了缓解急速增长的交通堵塞，北京计划建设世界上最大的地铁并大幅度拓展公交系统。

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Beijing is planning to build the world's biggest subway and dramatically expand its bus network as part of efforts to combat the city's fast-increasing traffic grid-lock (1), state press has said.

国家媒体报道，为了缓解急速增长的交通堵塞，北京计划建设世界上最大的地铁并大幅度拓展公交系统。

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The big idea: putting sensors everywhere that communicate in a mesh network and allow real-time tracking and optimization of everything from traffic to the power grid to the water supply.

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