Protection of concrete underground drain 混凝土地沟防护
building underground drain s 建筑物地下排水沟
Underground plastic drain pipe 埋地塑料排水管道
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。
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。
The feasibility and mechanism analysis of a penetrable pipe for soil base in the field used to irrigate and drain was disccued by mpns of the analyais of present underground irrigation systems.
通过对现有地下灌溉系统的分析，论述了田间地下土基透水管灌溉、排水兼用的可行性及机理分析。
应用推荐