英文關鍵字
algae
algal
background
bacteria
beach
beautiful
bloom
blue
bluegreen
color
cyanobacteria
danger
design
dirty
ecological
environment
environmental
flora
grass
green
grow
growth
harm
lake
landscape
life
marine
nature
nutrients
ocean
organic
pattern
photosynthetic
plankton
plant
pollution
pond
red
river
sand
scum
sea
summer
surface
temperament
texture
treadment
treatment
wastewater
water
weed