英文關鍵字
adult
air
architecture
boy
catastrophe
caucasian
chemical
chimneys
choke
city
cough
danger
dangerous
ecological
ecology
environment
environmental
factory
fear
gas
gasp
global
grunge
guy
hazard
health
holding
human
industrial
industry
male
man
mask
measure
one
people
person
phone
pipes
plant
pollutant
pollution
problem
protection
protective
respirator
risk
smoke
technology
wireless