英文關鍵字
beach
children
coast
danger
debris
dirt
dirtiness
dirty
disaster
dog
eco
ecological
ecology
environment
environmental
garbage
global
hazard
hygiene
island
junk
kids
litter
marine
nature
nondegradable
ocean
pet
planet
plastic
playing
polluted
pollution
problem
recycle
recycling
reuse
rubbish
sand
sea
shore
solid
toxic
trash
tropical
unhygienic
used
waste
water
world