filter underdrain system 滤池配水系统
underdrain equipment 底座排水装置
Underdrain of filter 滤池集水沟 ; [建] 过滤池暗沟
underdrain without slope 无坡降地面式暗沟
underdrain pipe 暗管排水
circular underdrain 环向盲沟
Wheeler underdrain system 韦勒下水道系统
N a drain buried below agricultural land (农田的)暗渠
V to bury such drains below (agricultural land) (在农田下)埋暗渠
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