英文關鍵字
girl
child
coughing
global
warming
atmosphere
poison
suffering
little
choking
heavy
factory
chemical
toxic
gas
smoke
flow
motion
smog
pollution
ecology
problem
air
environmental
city
environment
industry
health
chimney
fog
eco
change
breath
immunity
conceptual
planet
save
cancer
climate
danger
kid
caucasian
people
person
copyspace