英文關鍵字
aerial
algae
aquatic
biology
blue
contaminated
contamination
cyanobacteria
cyanobacterium
danger
dangerous
dirty
disaster
drone
ecological
ecology
ecosystem
environment
environmental
exterior
flora
green
growth
infest
island
landscape
natural
nature
organic
outdoors
plankton
plant
polluted
pollution
problem
river
scum
sewage
slime
slimy
summer
surface
swamp
texture
toxic
tree
waste
water