英文關鍵字
ashcan
cleaning
debris
dirt
dirty
dirtying
dump
dumping
dust
dustbin
dusthole
ecological
ecology
environment
environmental
food
garbage
global
heap
household
junk
junkyard
land
landfill
litter
lumber
mess
ordure
people
place
plastic
pollute
pollution
recycle
recycling
refuse
rubbish
sanitary
scrap
scrapheap
sidewalk
spoil
stairs
step
street
sweeping
trash
walk
walking
waste