英文關鍵字
against
awareness
banner
campaign
cardboard
concept
disaster
drain
dump
earth
eco
ecological
ecology
environmental
fighting
flow
flowing
forest
garbage
hand
litter
male
man
nature
paperboard
picket
pipe
planet
plastic
pollution
poster
problem
propaganda
protect
protection
protest
rally
recycle
reduce
revolt
river
rubbish
save
sewage
stone
stream
trash
volunteer
waste
world