英文關鍵字
animal
autumn
babies
bill
bird
black
cobs
cygnets
cygnus
dabbling
elegant
family
feather
feeding
females
flowing
glide
graceful
knob
lake
long
male
migratory
mute
nature
necked
olor
orange
pair
peaceful
pen
plant
plumage
pond
protective
river
summer
swan
swimming
water
waterfowl
white
wildlife