One day Sam buys a hot dog after school. Suddenly(突然)he stops and raises (抬)his head high. He keeps looking at the sky. It lasts (持续) two minutes. A woman passes by (路过). She sees Sam looking at the sky and she stops and also looks at the sky. The sky is blue with some white clouds. Many passers by stop. They looks at the sky, too. After a while Sam lowers(低下)his head. He laughs and asks, “What are you looking for in the sky?" The woman says, “Why are you looking at the sky?" “I don't look at the sky," Sam points to (指向) his nose. “My nose is bleeding(出血)”