英文關鍵字
aerial
air
atmosphere
chemical
chimney
city
cityscape
construction
cooling
copter
damage
danger
dioxide
dirty
ecology
emissions
energy
environment
environmental
exhaust
factory
fumes
generation
heating
industrial
industry
landmark
manufacture
manufacturing
morning
pipe
pollution
power
problem
sky
smog
smoke
stack
station
structure
sun
sunrise
technology
tower
tube
urban
view
water
white
winter