英文關鍵字
air
atmosphere
button
care
changing
chemical
chimney
city
climate
cloud
concept
danger
dirty
disaster
ecology
emission
energy
environment
environmental
exhaust
factory
fumes
gas
global
high
human
industrial
industry
influenza
knob
low
mask
pipe
polluted
pollution
problem
reverse
smog
smoke
so2
steam
technology
toxic
value
warfare
warming