英文關鍵字
air
architecture
atmosphere
background
blue
chemical
chimney
city
climate
coal
construction
copter
dioxide
dirty
dust
ecology
emissions
energy
environment
environmental
factory
fog
footprint
fuel
gas
global
heavy
industrial
industry
infrastructure
large
manufacturing
nature
pipe
plant
pollution
power
sky
skyline
smog
smoke
stack
station
steam
structure
technology
tower
toxic
white
winter