在地中海区域的早期文明中，拱形结构主要被运用在地下排水管上，但在地上建筑中首先发展并广泛使用拱门的是罗马人。
The arch was used by the early cultures of the Mediterranean area chiefly for underground drains, but it was the Romans who first developed and used the arch extensively in aboveground structures.
急流瘫痪了公用线路，冲破地下排水管道，弄翻陷入泥坑的汽车。
The rush of water downed utility lines, broke underground drainage pipes and flipped cars that remain Mired in mud.
本文通过工程实例，探讨了在进行城市地下排水管线探查的质量控制中需要注意的问题，以供参考。
This paper gives us a helpful solution by examples of the problems during quality control of inspection in city underground drainage pipeline.
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