英文關鍵字
green
film
blooming
algae
covered
surface
water
pollute
that
prevents
formation
oxygen
causes
death
aquatic
organisms
environmental
problems
disaster
mud
pollution
environment
swamp
pond
nature
ecology
polluted
lake
plant
dirty
natural
river
marsh
slime
scum
flora
pattern
summer
bog
wet
backdrop
waste
ecosystem
mire
biology
organic
slimy
bloom
algal
dirt
contaminated
danger
growth
background
texture
abstract
color