機器
aluminum
architecture
blue
chimney
economy
electricity
energy
engineer
environment
exterior
factory
fuel
fumes
furnace
gas
generator
hazard
heat
heavy
industrial
industry
light
machinery
metal
oil
petrol
petroleum
pipe
plant
pollution
power
production
red
refinery
resource
scaffold
sky
smog
smokestack
stairs
steel
structure
substance
tank
technical
tower
toxic
tube
work