英文關鍵字
air
asia
boy
catastrophe
chemical
chimneys
choke
city
concept
contamination
cough
damage
danger
dangerous
dirty
disaster
ecological
ecology
energy
environment
environmental
face
factory
filter
gas
gasp
guy
hazard
health
human
ill
industrial
industry
kid
male
man
mask
one
person
pipes
poisonous
pollution
protection
respirator
safety
smoke
stack
urban
virus
wear