英文關鍵字
bottle
canal
clean
concept
conservation
contamination
dirty
ecological
ecology
environment
floating
garbage
global
warming
green
heap
industrial
industry
junk
litter
material
nature
pile
plastic
bags
bottles
pollution
poison
pollute
polluted
problem
problems
protect
protection
recycle
recycling
river
stream
rubbish
sewage
stink
toxic
trash
unhygienic
urban
waste
water
world
day
throw