英文關鍵字
air
airpollution
atmosphere
background
blue
business
change
chemical
chemistry
chimney
climate
clouds
co2
coal
concept
concepts
damage
dark
development
dioxide
dirty
eco
ecology
economy
emission
energy
enterprise
environment
environmental
factory
fog
gas
global
harmful
industrial
industry
manufacturing
nature
pipe
pollution
power
sky
smog
smoke
smokestack
stack
steam
technology
tower
view