英文關鍵字
birds
black
brooklet
contaminated
creek
danger
dirty
drainage
dump
egret
end
environment
foam
forest
foul
grass
green
greenish
impure
influent
manmade
marsh
marshland
morass
mud
nature
nilgiri
nullah
outdoors
plants
plastic
polluted
rill
river
ruined
scum
spring
stream
swamp
tainted
trees
tributary
unclean
unhygienic
wasteland
water
watercourse
woods