英文關鍵字
air
asian
boy
building
catastrophe
chemical
chimneys
china
choke
climate
cough
damage
danger
dirty
ecological
ecology
energy
environment
epidemic
equipment
face
factory
gas
gasp
guy
health
human
industrial
industry
infection
kid
male
man
mask
mouth
one
person
pipes
pollution
problem
protection
protective
respirator
safety
sick
smoke
smokestack
urban
virus
wearing