地铁网；地铁线路系统
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地铁网；地铁线路系统；地铁网；地铁线路系统
the system of interconnected metro/subway lines in a city
The metro network in Moscow is one of the busiest in the world.
莫斯科的地铁网是世界上最繁忙的地铁网之一。
地铁网；地铁线路系统
the system of interconnected metro/subway lines in a city
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