assistance
bag
boot
care
caucasian
change
charity
child
child picking up trash
children
cleaning
collect
collection
color image
concepts
conservation
copy space
earth
eco
ecology
environment
garbage
happy
holding
horizontal
kid
litter
little
nature
one person
outdoor
picking
plastic
pollution
protection
recycle
recycling
rubbish
smile
social
taiwan
teenager
trash
volunteer
volunteering
waste
welfare
women
work