英文關鍵字
activist
asian
background
bag
bin
black
blue
bottle
city
clean
cleanup
closeup
collecting
community
ecology
empty
environment
environmental
forest
garbage
green
hand
holding
human
junk
litter
man
old
organization
park
people
pet
pick
picking
pile
plastic
pollution
recycle
rubbish
save
senior
solidarity
student
throwing
trash
volunteer
waste
young