英文關鍵字
crystal
hoarfrost
wintertime
feet
snowy
frosty
shadows
trace
ecology
dove
motion
way
snow
background
footprint
outdoor
season
bird
frost
cold
winter
january
nature
foot
december
animal
walk
mark
step
footstep
black
texture
pigeon
direction
track
white
freeze
ice
pattern
wild
meet