"Ode of Mulan" is a famous folk song of the Northern Dynasties in ancient China. The full text is as follows: "Ode of Mulan" Chirp and chirp Swallows fly. decrease and increase The hook flies. Floating in the wind, what is it like? Heaven and earth are like a sandgull. Among them,"Chirp" was used to describe the sound of swallows flying, and "Swallow Flying" was used to describe the scene of swallows flying. Chirp and chirp Swallows fly. decrease and increase The hook flies. Floating in the wind, what is it like? Heaven and earth are like a sandgull. This poem depicted the flying swallows, showing the beauty of nature and the beauty of life. Among them, the phrase " lower and raise the hook to fly " was widely praised by later generations as a standard sentence to describe the arrogance and confidence of a character.