英文關鍵字
backgrounds
bird
bottles
bulky
cleanup
concepts
conservation
dirt
dirty
dump
environment
food
garbage
group
heap
industry
junk
land
landfill
large
life
midden
mountain
nature
objects
obsolete
outdoors
packages
paper
part
plastic
pollution
putrid
recycling
rotting
ruined
seagull
stack
substance
summer
sun
toxic
waste