英文關鍵字
air
atmosphere
beautiful
belching
blue
business
change
chemical
chimney
climate
cloud
coal
cold
construction
damage
dioxide
dirty
ecology
energy
environment
environmental
factory
fog
fumes
gas
global
heavy
industrial
industry
nature
physical
pipe
plant
polluting
pollution
polution
power
sky
smog
smoke
stacks
station
steam
stunning
thick
toxic
ugly
warming
white
winter