英文關鍵字
animals
beating
beatings
bird
birding
birds
birdwatching
common
danube
delta
enviroment
flight
fly
freshwater
green
hallow
hirundo
juvenile
lake
lakes
landscape
marshes
mesh
nature
ponds
reserve
river
rivers
salt
sea
seabird
season
small
summer
sunset
swallow
swamp
tern
terns
vegetation
water
wetland
wetlands
wild
wilderness
wildlife
wildness
wings