機器
blue
building
change
chemical
chemistry
climatic
climatic change
clouds
complex
contaminated
duct
engine
engineering
environment
environmental
equipment
factory
fuel
gas
heavy
industrial
industry
iron
landscape
machinery
metal
oil
outdoor
petrochemical
petroleum
pipe
plant
pollution
power
production
refinery
silver
sky
station
steel
structure
tanks
technology
tower
tube