英文關鍵字
air
atmosphere
backgrounds
carbondioxide
chemical
chimney
day
dirty
dust
environment
environmentaldamage
exhaust
factory
fuelandpowergeneration
fume
globalwarming
industry
midair
moscow
outdoors
pipe
plant
pollution
powerstation
russia
sky
smog
smoke
smokestack
steam
sunlight
toxic
urbanscene
white