英文關鍵字
air
blue
chemical
chimney
cloud
construction
energy
environment
factory
global
heavy
industrial
industry
metallurgy
nobody
nopeople
objects
pipe
pipes
sky
smog
smoke
steam
technology
tower
toxic
white
英文關鍵字
air
blue
chemical
chimney
cloud
construction
energy
environment
factory
global
heavy
industrial
industry
metallurgy
nobody
nopeople
objects
pipe
pipes
sky
smog
smoke
steam
technology
tower
toxic
white