Expansion: The content of Pipa Travel, mentioned in the preface, tells the story of the author's relegation from Chang 'an to Jiujiang, listening to an Chang 'an's main player playing the pipa and telling his life story. As a long narrative poem, this poem is rigorous and meticulous in structure, with twists and turns in plot and ups and downs. Hong Mai in Song Dynasty commented on it in Rongzhai Wu Bi: Bai Letian wrote a pipa, but readers admired its charm, praised its lyrics and praised the shortcomings of Yuefu, so it was really a work advocated by Chang 'an people. Stealing doubts. Although the outline of Tang Shifa here is broad, Lotte once lived in a taboo secret and lived in exile for a short time, so he wouldn't take a night walker alone on a woman's boat and drink with her. As for the fun of playing silk, I will go in the middle of the night. Don't worry about businessmen, can we talk about this later? Lotte means to express hatred for the end of the world.