英文關鍵字
cement
circle
concrete
conduit
construction
dig
ditch
drain
drainage
earth
earthworks
engineering
equipment
gray
hole
house
improvement
industry
infrastructure
install
installation
land
large
laying
material
pipe
pipeline
pipes
pit
plumbing
reinforced
repair
replacement
ring
rings
round
septic
sewer
sewerage
site
soil
storage
stormwater
system
tank
trench
underground
wastewater
water
watertightness
well
work
works