機器
canalization
connect
construction
crude
dewatering
dig
digger
dishwater
ditch
drain
drainage
duct
earthwork
equipment
flange
float
flow
full
hole
income
industrial
industry
liquid
overflowing
pipe
pipework
pit
pump
pumping
rainwater
replacement
rich
safety
sewage
sewer
sewerage
slop
slops
stream
street
submersible
trench
tube
utilities
valveworker
waste
wastewater
water
work