英文關鍵字
agriculture
animal
chimney
city
concept
danger
dangerous
dead
death
dirty
disaster
earth
ecological
ecology
electricity
emission
environment
facility
factory
grass
graze
grazing
health
horse
industry
landscape
livestock
meadow
mongolia
nature
nobody
pasture
plant
poison
pollute
polluted
pollution
power
problem
risk
smoke
symbol
technology
toxic
toxication
ulaanbaatar
unhealthy
vapor
view
waste