英文關鍵字
adult
alone
asphalt
attitude
background
behavior
bin
can
care
catching
city
civic
civility
clean
cleaning
close
closeup
conservation
contamination
dump
dumpster
eco
ecologic
ecological
ecology
environment
environmental
female
garbage
girl
good
hand
lady
litter
littering
one
outdoor
paper
park
people
person
positive
preservation
protection
recycle
responsibility
responsible
rubbish
save
service
sidewalk
single
social
street
teen
teenage
teenager
throwing
throws
town
trash
unfocused
urban
volunteer
volunteerism
walk
walking
woman
young