英文關鍵字
area
attractive
background
bottle
boy
care
clean
cleaning
closeup
collection
concept
conscious
container
contaminated
conversation
day
dirty
disease
earth
ecology
environment
environmental
floating
garbage
glove
gloves
good
green
hand
human
industry
keep
lake
life
mind
nature
outdoor
park
picking
plastic
pollution
pond
problem
recycle
river
rubber
rubbish
sea
sewage
surface
think
volunteer
volunteering
waste
water
worker