英文關鍵字
air
atmosphere
background
blue
building
business
chemical
chemistry
chimney
chp
city
cloud
coal
construction
dirty
ecology
emission
energy
environment
environmental
equipment
factory
fuel
gas
gasoline
global
heavy
industrial
industry
landscape
manufacturing
nature
oil
petroleum
pipe
plant
pollution
power
production
refinery
silhouette
sky
smog
smoke
station
steam
sun
sunset
technology
tower
toxic