暗管排水
closed drainage
underground pipe drains
subsurface drainage
sub drain
underground pipe draining water
underground pipe drainage
农田暗管排水工程
conduit project for farmland drainage
农田排水暗管
conduit for farmland drainage
给水排水管道
feed water and drainage pipeline
feed water and drain pipeline
埋地排水管
underground drainage pipe
non pressure drainage and sewerage pipe
underearth drainage pipe
塑料埋地排水管
plastic underground drainpipe
underground drainage plastics pipes
non pressure drainage and sewerage plastics pipe
暗排水系统
drainage system with underground pipe lines
单立管排水系统
Single stack drainage system