英文關鍵字
activist
background
bag
bank
bottles
care
caucasian
cleaning
cleanup
collects
concept
conservation
contamination
day
discarded
dump
earth
eco
ecological
ecology
environment
environmental
garbage
global
help
holding
industry
junk
land
litter
manual
nature
outdoors
park
people
picking
plastic
problem
protecting
protection
protective
recycle
river
riverside
rubbish
save
standing
trash
volunteer
walks
waste
woman
work
worker
world
young