英文關鍵字
air
architecture
biohazard
boy
catastrophe
catastrophy
chemical
chimneys
choke
city
climate
cough
crisis
danger
dangerous
dirty
earth
ecological
ecology
environment
environmental
equipment
factory
gas
gasp
global
grunge
guy
health
human
industry
male
man
mask
mobile
people
person
phone
pipes
plant
pollution
problem
protection
protective
respirator
risk
smoke
stack
toxic
wearing