機器
air
atmosphere
blue
building
car
chemical
chimney
chrome
dioxide
dirty
ecology
energy
engine
environment
environmental
exhaust
exhaust ventilation system
factory
fuel
fumes
gas
global
industrial
industry
manufacturing
metal
metallic
motor
pipe
plant
pollution
power
refinery
sky
smog
smoke
speed
station
steam
steel
supply
technology
tower
toxic
transport
transportation
vehicle
warming
white
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