Being the material foundation of urban traffic, road network is the lifeline of the city, which supports other life systems.
道路网络作为城市交通的物质基础，是城市的生命线，支撑着其他生命系统。
Most of lifeline network systems in Chinese cities have not been passed through normal aseismic design, but many big and medium cities may be have the seismic risk background.
我国城市的地下管网系统，大多数没有经过正规的抗震设计，而不少大、中城市又有着可能遭受中强地震影响的背景。
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