It looked there like a network of liquid threads which doubtless reached the river by some underground drain.

从这里看起来象是一片水网，无疑地，这些水都从地下泉眼直通到河里。

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The whole city drainage system program is as follows: rain water wells road, clay and drain well across the street and drainage inspection wells and underground drainage main lines.

市政整体排水系统程序如下：路面雨水→雨水井→沉泥井→过街排水管→排水检查井→地下排水主干线。

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Underground principal drain pump is one of the devices that consume the most power in coal mine.

井下主排泵是煤矿耗电量最多的设备之一。

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