英文關鍵字
air
bag
blot
city
defile
dirty
dross
dump
ecological
environmental
foul
garbage
heap
image
industry
junk
landfill
large
litter
management
mountain
nature
offal
outdoors
package
paper
pelf
pile
plastic
pollution
recycle
recycling
refuse
remain
rubber
rubbish
site
smear
smirch
soil
stain
sweepings
swill
trash
tyre
unclean
waste
wheel
whirl
wind