英文關鍵字
backhoe
cement
concrete
construction
culverts
dig
digger
dirt
drainage
earth
earthwork
excavate
excavation
excavator
ground
groundwork
infrastructure
laying
loader
main
pipe
pipes
plumbing
reinforced
repair
replacement
ring
rings
sanitary
scoop
sewage
sewer
sewerage
site
storm
system
treatment
trench
underground
utility
water
well
wells
work