機器
aged
background
close
construction
corrosion
device
dirty
drain
drink
drop
energy
equipment
factory
faucet
flowing
fuel
gas
grunge
handle
industrial
industry
iron
metal
nature
oil
old
outdoor
pipe
pipeline
piping
plumbing
power
pressure
pump
retro
rural
rust
rusty
spout
steel
system
tap
technology
thirsty
tube
valve
vintage
water
wheel