英文關鍵字
air
atmosphere
background
blue
carbon
chemical
chimney
city
climate
cloud
co2
coal
construction
cooling
dirty
dust
ecology
electric
energy
environment
exhaust
factory
fuel
fumes
gas
global
industrial
industry
nature
nuclear
pipe
plant
pollution
power
radioactive
sky
smog
smoke
stack
station
steam
steel
structure
technology
tower
toxic
warming
waste
white
winter