The cows' rumps were marked with a number. 奶牛的臀部标着一个数字。Suddenly the cow kicked up its hind legs. 奶牛突

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The cows' rumps were marked with a number.

奶牛的臀部标着一个数字。

Suddenly the cow kicked up its hind legs.

奶牛突然尥起了蹶子。

Some children develop a sensitivity to cow's milk.

有的孩子对牛奶过敏。