英文關鍵字
algae
aquatic
balance
biotope
challenge
coldwater
colorful
cosmopolitan
danger
destroy
ecology
ecosystem
environment
flora
footage
freshwater
habitat
human
impact
influence
lake
litter
lush
moderate
motion
movement
natural
organic
organics
plant
pollution
river
scenery
season
shallow
summer
sunny
temperate
threat
underwater
unhealthy
vallisneria
vegetation
vulnerable
water
weak