英文關鍵字
accident
canalisation
clean
conduit
construction
culverts
damage
digging
dirty
distribution
drain
drainage
engine
equipment
flood
foundation
generator
grunge
hole
improvement
industrial
infrastructure
inside
installation
installing
interior
joints
machine
maintenance
network
pipe
pipeline
plumber
plumbing
problems
pumping
repair
reservoir
sanitary
service
sewage
sewer
sewerage
supply
system
tunnel
underground
valve
water
work