英文關鍵字
action
air
architecture
bad
chimney
cold
ecology
environmental
fuel
house
motion
object
pipe
pollution
private
problem
season
sky
smoke
toxic
winter
英文關鍵字
action
air
architecture
bad
chimney
cold
ecology
environmental
fuel
house
motion
object
pipe
pollution
private
problem
season
sky
smoke
toxic
winter