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.
随着淡化技术越来越广泛的使用，它的环境影响，包括进水和排水结构的设计，正招致人们不断深入的审视。
As desalination becomes more widespread, its environmental impacts, including the design of intake and discharge structures, are coming under increased scrutiny.
问题包括排水管被堵、地基下沉，有时甚至出现了严重的结构性裂缝。
Problems include blocked drains, sunken foundations and, sometimes, large structural faults.
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