英文關鍵字
altruism
any
bag
blue
bottle
care
clean
cleaning
cleans
cleansing
cleanup
collecting
collection
collects
concept
cup
debris
dirty
earth
eco
ecological
ecology
ecosystem
environmental
forest
free
friendly
garbage
girl
glove
green
hand
human
left
man
natural
nature
other
outdoor
packet
park
place
planet
plastic
pollution
preservation
problem
take
takes
trash
trashfree
voluntary
volunteer
volunteering
woman
work
yourself