英文關鍵字
background
beg
bill
bred
breed
breeding
conditions
cone
cones
control
crossbill
crossed
cut
design
designed
detail
drink
eat
eats
effect
energy
environment
fed
feed
feeding
female
fir
flight
fly
food
high
large
life
lives
look
male
perfect
picking
pine
power
safe
safety
save
seed
seeds
skill
skills
sky
strip
tip
water