例句：
The little rabbit is a doctor.
小兔子是一位医生。
A little rabbit is hopping by.
一只小兔子正在蹦过来。
This is a story about rabbit.
这是一个关于兔子的故事。
The carrot is his favorite vegetable.
胡萝卜是他最喜欢的蔬菜。
He picks up a carrot.
他捡起一根胡萝卜。
It's eating a carrot.
它在吃胡萝卜。
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