英文關鍵字
activist
adult
american
bag
bottle
care
caucasian
charity
community
cooperation
eco
ecology
environment
female
garbage
grass
green
group
human
kid
lifestyle
looking
man
natural
nature
outdoors
package
park
people
person
plastic
public
recycle
social
standing
summer
talk
talking
team
teamwork
teenager
together
trash
voluntary
volunteer
volunteering
volunteerism
waste
woman
young