暗管排水
underground pipe draining water
underground pipe drains
underground pipe drainage
closed drainage
subsurface drainage
sub drain
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
underearth drainage pipe
non pressure drainage and sewerage pipe
塑料埋地排水管
underground drainage plastics pipes
plastic underground drainpipe
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