英文關鍵字
algae
appeared
contamination
dense
difficult
environmental
feed
film
fish
fry
impurity
layer
matter
oligotrophic
organic
oxygen
pollutants
pollution
pond
reservoir
rotting
starvationn
surface
water
英文關鍵字
algae
appeared
contamination
dense
difficult
environmental
feed
film
fish
fry
impurity
layer
matter
oligotrophic
organic
oxygen
pollutants
pollution
pond
reservoir
rotting
starvationn
surface
water