This sentence comes from a first-grade nursery rhyme. The content is as follows: Xiaoyun goes to get oil by bike. When his little friend kicked the ball, it flew and scared the cow. Xiaoyun fell down and spilled oil all over. Nurseryrhyme is a short poem with folk flavor, which is mainly accepted by children. It is one of the oldest and most basic genres of children's literature. Children's songs are a kind of folk songs, which are found all over the country. The content mostly reflects children's interest in life and spreads knowledge about life and production. The lyrics mostly use the method of comparison, and the rhyme is smooth and easy to catchy. The tune is close to the tone of language and has a brisk rhythm. There are solos and duets, such as Twinkle, Twinkle, Little Star, which is recognized as the world's first children's song.