英文關鍵字
activist
biology
bottles
care
change
charity
childhood
children
clean
cleaning
conservation
earth
eco
ecologist
ecology
ecosystem
environment
environmentalism
environmentalist
garbage
girl
green
help
horizontal
kids
lawn
leisure
lifestyle
litter
moral
nature
outdoors
paper
park
planet
plastic
saving
spring
summer
trash
video
voluntary
volunteering
volunteerism
volunteers
woman