See "See the Dragon at the Head"
Word decomposition
Dragon's explanation. It's called dragon. According to legend, dragons are unpredictable, so they are called this thing. "Biography of Han Poetry" Volume 5: "If Long Bian, flying articles are big, and the way of Guan Yu is also big!" Selected Works of Zhang Heng: "If the dragon changes, the emperor after the chapter will be heavier." Xue Zong's note: "When the dragon rises, it ascends to heaven, while when it dives, it becomes muddy, so the clouds change."