英文關鍵字
activist
adult
altruism
bag
beach
bottle
boy
care
charity
child
children
cleaning
community
conservation
cooperation
dirty
ecology
ecosystem
environment
environmental
friends
friendship
garbage
glove
green
group
hand
handshake
kid
man
nature
outdoor
package
people
plastic
pollution
recycle
recycling
rubber
rubbish
smiling
social
team
teamwork
teen
trash
tshirt
volunteer
waste
woman