Introduction to the stone coffin: According to legend, during the Qianlong period when the Hanlin Academy was editing and preparing for the military affairs department, Ke Jin once traveled to Leishan and left a poem "Ode to the Stone Coffin", in which "Snow and frost hit the mountains and the mountains were filial, and the rain and the wind shook the trees. The aphorism "The tree mourns" is still popular among people and is widely circulated.