英文關鍵字
abandoned
bolt
building
construction
control
crane
crank
cut
danger
desolation
detail
dirty
energy
engineering
environment
equipment
factory
feeling
foliage
fuel
gas
green
grunge
industrial
industry
iron
line
machinery
massive
metal
nature
old
paint
peeling
pipe
pipeline
plant
plumbing
power
production
pump
rusty
steel
supply
system
tube
valve
wind
yellow