英文關鍵字
altruistic
bag
beach
bottle
bottles
clean
cleaning
collecting
community
dirty
discarded
ecological
ecology
environment
environmental
female
garbage
hygiene
lake
landscape
litter
man
natural
nature
outdoor
outdoors
park
participation
people
person
plastic
pollution
recycle
river
rubbish
sand
sea
shore
team
tidy
together
tourist
trash
two
volunteer
waste
water
woman