機器
background
bolt
broken
clean
construction
control
corrode
corrosion
crane
crisis
dirty
distribution
energy
engineering
equipment
faucet
fuel
gas
grunge
industrial
industry
iron
isolated
metal
oil
old
open
pipe
pipeline
plumbing
power
pressure
pump
pumping
red
rust
rusty
steam
steel
steering wheel
stop
supply
tap
technology
tube
turn
valve
waste
water