英文關鍵字
adult
animal
aquatic
autumn
back
background
beak
beautiful
behavior
bill
bird
black
blue
bright
brightness
color
cygnus
daylight
eye
fauna
feathers
graceful
head
his
image
imposing
lake
love
male
mirror
mute
nature
neck
ocean
olor
orange
ornithology
outdoors
perspective
plumage
pond
pool
proud
red
reflection
river
sea
single
spring
summer
sunrise
surface
swan
swimming
water
waterfowl
white
wild
wildlife
wing