These two sentences describe the * * similarity of "we are all unhappy-forever" between ourselves and the pipa girl. Although their origins and experiences are very different, there are similarities: one is "a daughter of the capital" and the other "resigned from the capital last year", both of whom came to Jiangzhou, a remote place from Chang 'an, Kyoto; One is a famous artist in Kyoto, and the other is a talented poet, both of whom are outstanding; A businessman who got married because of the decline of color and a man who was relegated because of his outspoken remarks all suffered misfortune from glory to decline, and they all lived a lonely and desolate life with full "sadness and dark hatred". Because of this, the poet's superb skill in writing pipa girls is to arouse people's sympathy for pipa girls by expressing their sad life experience. The poet's sad life experience of the pipa girl is to express his political frustration, his anxiety about the left leaning and his hatred of relegation. This is the author's writing motivation, and these two sentences are the theme of the whole poem.