英文關鍵字
swallows
swift
shore
flock
nest
bird
ornithology
hole
cliff
sand
collar
cooperation
group
togetherness
life
flying
speed
reproduction
family
native
biology
safety
fast
organism
conservation
fly
vertical
protection
wing
feather
land
migration
wildlife
flight
ecology
tunnel
zoology
wild
rock
sandy
morning
fauna
ground
breeding
coastline
nests