The city planner decided to build an underground drainage system.

城市规划师决定建一个地下排水系统。

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Clean and dredge all underground drainage pipe, floor traps & sewerage pits.

酒店内建筑及所有场地的地下管道、地漏和阴井的清理、疏通。

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The actual application showed that the system improves safety and reliability of underground drainage.

实际应用表明，该系统提高了煤矿井下排水的安全性和可靠性。

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There is an underground drainage system on site which filters contaminated waste fluids.

CNN: From landfill to landscape

Macri said Wednesday that the only solution is for the constantly warring governments to work together on expensive and long-term public works projects, creating huge underground drainage pipes to carry increasingly common torrential rains out to the Rio de la Plata.

NPR: Argentina: Flooding From Torrential Rains Kill 52