英文關鍵字
air
boy
building
catastrophe
chemical
chernobyl
chimneys
china
choke
city
cough
damage
danger
dirty
ecology
energy
environment
factory
filter
gas
gasp
global
guy
health
human
ill
industrial
industry
infection
kid
male
man
mask
medical
people
person
pipes
plant
pollution
problem
protection
protective
respirator
safe
sick
smoke
stack
standing
urban
wearing
young