英文關鍵字
algae
aquatic
biology
closeup
contaminated
contamination
cyanobacteria
danger
dangerous
dirty
disaster
ecological
ecology
ecosystem
environment
environmental
exterior
flora
glove
green
hand
infest
medical
natural
nature
organic
outdoors
plankton
plant
polluted
pollution
problem
protective
research
river
scoop
scum
sewage
slime
slimy
summer
surface
swamp
texture
toxic
waste
water