英文關鍵字
abstract
cableduct
check
chemistry
circle
coated
colorful
conduit
control
depth
dirty
drop
effect
end
equipment
field
green
ground
hole
industrial
industry
inside
install
journey
laying
light
long
mess
move
movement
pipe
pipeline
piping
plastic
plumbing
point
pvc
rays
repair
resistance
rib
ribbed
round
sharpening
slide
speed
surface
the
transportation
tube
tunnel
under
underground
utilities
view
wall
waste
wormhole
zoom