英文關鍵字
amount
bags
bottle
bottles
chemical
chemistry
cleanup
cruel
danger
dirt
dirty
dump
dumping
ecology
environment
garbage
health
horror
impure
junk
large
material
nature
our
plastic
polluting
pollution
poor
poverty
problem
reserve
river
rotting
rubbish
sea
sewage
smell
smelling
stream
substance
toxic
trash
ugliness
unhealthy
unhygienic
unpleasant
urban
waste
water
waters