例句：
The little rabbit is a doctor.
小兔子是一位醫(yī)生。
A little rabbit is hopping by.
一只小兔子正在蹦過(guò)來(lái)。
This is a story about rabbit.
這是一個(gè)關(guān)于兔子的故事。
The carrot is his favorite vegetable.
胡蘿卜是他最喜歡的蔬菜。
He picks up a carrot.
他撿起一根胡蘿卜。
It's eating a carrot.
它在吃胡蘿卜。