Zhang Ping, a teenager whose characters like taking pictures, and Li Nainai, who cleans the park, how to write a story?

One morning, Zhang Ping, a teenager who likes to take pictures, is choosing different angles to shoot the morning glow in the park. Suddenly, he saw Li Nainai who was cleaning the park fall down. When Zhang Ping saw him start running, he saw Li Nainai stop breathing. Zhang Ping knew that he had to do CPR, otherwise Li Nainai could not live. He immediately took off his coat, spread it on the ground, turned Li Nainai over and began to do chest compressions and artificial respiration. Your grandmother was out of breath when someone called an ambulance.