機器
and
building
cellar
connect
construction
contractor
crude
dewatering
dig
digger
ditch
drain
drainage
duct
earth
earthwork
equipment
excavation
excavator
flange
float
flow
gas
hole
income
industrial
industry
liquid
pipe
pipework
pump
rainwater
replacement
rich
safety
sewage
sewer
sewerage
site
stream
street
submersible
trench
tube
utilities
valve
valveworker
water
work