英文關鍵字
air
beach
biology
bottle
city
clean
clip
coast
coastline
conservation
conserve
conserved
creatures
danger
dangerous
debris
dirt
dirty
discarded
environment
environmental
excess
extinct
garbage
hazard
household
land
landscape
litter
marine
material
ocean
plastic
polluted
pollution
recycle
recycling
refuse
river
rotting
rubbish
sea
sewage
smell
trash
unhealthy
video
waste
water