I really know this. I heard it from an old Chinese doctor. He said that during the Three Kingdoms period, Cao Cao's sons Cao Zhi and Cao Pi competed for the position of Chu Jun, and later he was demoted as "the king of East Asia". When I first arrived in the degraded land, Cao Zhi's body was always weak. Later, I became stronger and stronger because I often ate local chewing gum. Because he was a famous poet in the Eastern Han Dynasty, he wrote Fei Long with a brush. Suddenly met two children, the color is fresh and good. Ride on a white deer and hold the grass in your hand. I know real people, the dragon knelt down and asked. Xideng Yutang, Fulu. Give me an elixir made by the Jade Emperor. Teach me to feed my brain. Life, like a stone, is hard to grow old forever. "The fairy medicine referred to in Cao Zhi's poems is Ejiao in Dong 'e County.