英文關鍵字
air
atmosphere
black
burning
business
chemical
chimney
city
cloud
clouds
co2
color
construction
dusk
ecology
energy
environment
environmental
factory
fog
fuel
fumes
funnel
grey
heat
industrial
industry
landscape
light
manufacturing
nature
outside
ozone
pipes
plant
pollute
pollution
power
russia
silhouette
sky
smog
smoke
stack
steam
substance
sun
sunset
technology
tower
toxic
tube
urban
white
winter