英文關鍵字
activity
altruism
blue
bottle
care
clean
cleaning
cleanup
collecting
collection
collects
concept
dirty
earth
eco
ecological
ecology
ecosystem
environmental
forest
friendly
garbage
girl
glove
green
hand
human
mask
medical
natural
nature
park
planet
plastic
pollution
preservation
problem
take
takes
traces
trash
trashfree
volunteer
volunteering
woman
work