英文關鍵字
autumn
bag
balance
branch
container
damage
decompose
disposable
disturbance
dry
dusk
ecology
ecosystem
environment
evening
garbage
grass
hanging
harmful
hazard
human
impact
landscape
natural
nature
negative
negligence
outdoor
plant
plastic
pollution
polyethylene
problem
recklessness
rubbish
save
threat
trash
tree
used
warning
waste