What does it look like? One spring in the Ming Dynasty, the spring was bright and the weather was warm. Cao Xian asked Yan Song to go for an outing in the suburbs. When they left the city, Cao Xian made a statement, looked at the towering walls and asked Yan Song to make a bottom line. The first part of Cao County Order is: What does it look like? Yan Song looked at the breach of the city wall as if it were a human tooth, and blurted out: Teeth bite the sky. Yan Song thought the bottom allied was clever and correct, but he was rejected by Cao County Order.