英文關鍵字
bend
black
brown
connection
construction
dig
ditch
domestic
economy
fitting
flowing
ground
heating
home
household
improve
infrastructure
labor
labour
line
local
maintenance
mess
municipal
municipality
new
newly
pipe
pipeline
piping
plastic
plumber
plumbing
pvc
repair
residential
rubbish
running
sand
service
supply
system
technology
tube
upgrade
water
yellow