英文關鍵字
arc
bend
building
connection
construction
cylinder
dig
drainage
earth
energy
environment
equipment
excavation
flow
gas
hang
heat
helmet
industrial
industry
installation
laid
line
liquid
outdoor
pipe
pipeline
piping
plastic
plumbing
project
round
rustproof
sand
sewage
site
soil
surface
technology
terrain
trench
truck
tube
tubular
unfinished
weld
work