英文關鍵字
common
water
hyacinth
hyacinths
floating
plant
slowly
flowing
surface
sri
lanka
river
aquatic
ovate
leaves
fastest
growing
plants
invasive
species
bodies
harmful
body
invasion
serious
pest
infestation
invaded
cause
disaster
weed
japanese
trouble
biodiversity
reflection
sky
flow
travel
pontederia
crassipes
scenic
beautiful
natural
nature
environment
green
outdoor
beauty
peaceful
earth
scenery
shore
landscape
background
autumn
scene
riverside
wild
view