英文關鍵字
abandoned
algae
animal
aqua
background
blue
breathe
bubble
catfish
chemical
cover
danger
dangerous
dead
die
dirt
dirty
environment
fish
float
foam
foul
garbage
grain
green
issue
lake
marine
midst
nasty
nature
outdoor
oxygen
plastic
poison
pollution
pond
pool
problem
refuse
river
rotten
save
severe
sewage
smell
surface
survival
toxic
trash
tries
wastrel
water