英文關鍵字
bank
beach
cleanup
concept
conceptual
contaminated
danger
dangerous
dirt
dirty
disaster
drooped
dump
dumped
ecology
empty
environment
environmental
forest
garbage
grass
green
industrial
lake
landscape
litter
littered
natural
nature
outdoor
plant
plastic
polluted
pollution
pond
problem
recycle
recycling
refuse
river
riverbank
rubbish
rural
spring
styrofoam
surface
sweepings
toxic
trash
tree
waste
water