There always is water standing in depression of urban overpass or under-crossing tunnel, therefore it is very necessary to set up a monitoring system for road waterlogging.
在城市立交桥或下穿隧道的低洼处常会有大量积水，因此需要建设道路积水监测系统。
There always is water standing in depression of urban overpass or under-crossing tunnel, therefore it is very necessary to set up a monitoring system for road waterlogging.
在城市立交桥或下穿隧道的低洼处常会有大量积水，因此需要建设道路积水监测系统。
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