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oink oink
cow
It's a cow.
moo
moo
sheep
It's a sheep.
baa
baa
pig
pigs
单数
复数
cow
cows
sheep
sheep
Let's chant
pig pig, it's a pig, oink oink
cow cow, it's a cow, moo moo
sheep sheep, it's a sheep, baa baa
What's missing?
sheep
pig
cow
farmer
farm
three pigs
a black and white cow
two sheep