英文關鍵字
dirty
technology
factory
smog
environment
ecology
steam
pipe
industrial
chimney
pollution
chemical
power
smoke
cloud
fuel
warming
aerial
production
emissions
toxic
dioxide
pipes
smokestack
climate
above
atmosphere
uav
air
environmental
russia
stack
plant
global
chemistry
tube
quadcopter
sky
building
europe
industry
damage
drone
refinery
dramatic
evening
energy