英文關鍵字
aerial
air
beautiful
blue
building
change
chemical
chimney
city
climate
cloud
clouds
coal
dark
dawn
disaster
dusk
emissions
energy
environment
environmental
evening
factory
fuel
harmful
industrial
industry
lake
landscape
light
morning
nature
night
oil
orange
plant
pollution
poor
power
refinery
river
sky
skyline
smog
smoke
smoking
stack
station
steam
summer
sun
sunlight
sunrise
sunset
technology
theme
tree
trees
view
water
yellow