The buildings are made of burnt brick, with an elaborate system of sewers and Wells.

这些建筑物是用烧成的砖砌成的，有着精心建造的下水道和水井。

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With the deep tunnel system, the sewer reticulation system in Singapore will, in future, consist of only gravity sewers linked to deep tunnels.

与深隧道系统，污水管网系统，在新加坡，将在不久将来，构成只有重力下水道相连的深层隧道。

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Ofwat's chief engineer, Bill Emery, insisted there was no crisis in the sewerage network but said a monitoring system had been put in place to forewarn of collapsing sewers.

BBC: NEWS | Programmes | File on 4 | Neglected sewers threaten floods

Like many cities, Greenwich has created a geographic information system - a map that shows all the hidden bones and arteries of modern civilization: water mains, storm sewers, utility lines.

NPR: Security Officials Seek to Block Some Online Maps