What does the poem Mujiangyin describe?

Ode to Mujiang is a four-line poem written by Bai Juyi, a poet in Tang Dynasty. Written in 822 (the second year of Changqing), Bai Juyi was on his way to Hangzhou as a secretariat. At that time, the court politics was dark, and Niu and Li Shiqiu were fierce. The poet tasted the taste of being an official and asked for a job outside. This poem reflects the author's relaxed and carefree mood after leaving the court. The poet used novel and ingenious metaphors in this poem, creating harmony and harmony.