This poem came from the Tang Dynasty poet Wang Zhihuan's poem "Climbing the Stork Tower", which described the scenery beyond the Great Wall. In the thousand peaks long smoke, the setting sun, the lonely city closed. This sentence depicted the high sky beyond the Great Wall, the endless mountains, the afterglow of the setting sun, and the lingering smoke, creating a lonely and bleak atmosphere. At the same time, the closed city also hinted at the history of the city being abandoned or abandoned, as well as the tragic and desolate war beyond the Great Wall. The whole poem was profound and philosophical. It was a classic poem of the Tang Dynasty.