英文關鍵字
air
atmosphere
blue
chemistry
chimney
clean
cleaning
climate
cloud
danger
dirty
dust
echnology
effect
emission
energy
environment
exhaust
factory
filter
fog
fume
fumes
greenhouse
grunge
industrial
industry
nature
outdoors
ozone
pipe
pollution
power
roundly
sky
smog
smoke
stack
station
steam
steaming
steel
technical
technology
tower
toxic
warm
white
winter