英文關鍵字
algae
american
carpeting
channels
clarification
cleaning
cleans
contamination
crassipes
ecological
ecology
eichhornia
environmental
eutrophication
fertilizer
grows
growth
hinders
hyacinth
invasive
issuen
lake
lakes
macrophyte
murky
nature
navigation
organic
phosphates
plant
pollution
pond
problem
purified
reclamation
reservoir
river
rivers
species
tropical
utrophication
vietnam
vietnamese
water