The low frequency screening effect against electromagnetic influence is very strong in urban areas because there are a lot of underground metallic pipes.
城市地区由于存在大量地下金属管道，因而电磁屏蔽效应十分良好。
To lay various kinds of underground pipes by non-excavation construction technology can greatly reduce the influence of traffic, noise and dust on the environment in the urban districts.
采用非开挖施工技术敷设各种地下管线，可大大降低交通、噪音、粉尘对城区环境的影响。
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