英文關鍵字
activist
background
chemical
clean
community
dangerous
dirt
dirty
dump
earth
eco
ecological
ecology
encourage
environment
environmental
garbage
green
help
invocatory
landfill
litter
man
mask
mountain
nature
outdoor
person
planet
plastic
pollution
poster
protection
recycle
recycling
respiratory
reuse
rubbish
safety
save
smart
symbol
toxic
trash
volunteer
waste
woman
world
young