機器
environmental
architecture
buildings
buildings factory
business
change
chemical
chimney
climate
colorful
construction
development
ecological
energy
equipment
fabric
factory
fossil
fuel
gear
graphic
icons
illustration
industrial
industry
manufacture
manufacturing
mechanism
petrochemical
plant
pollutants
pollution
power
processing
production
products
profit
refinery
resources
revolution
schedule
set
smog
smoke
smokestack
symbol
technology
working