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。
Screening effect relys upon both absorption loss and reflection loss.
屏蔽效果主要是靠吸收损耗与反射损耗。
Screening effect relys upon both absorption loss and reflection loss.
屏蔽效果主要是靠吸收损耗与反射损耗。
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