The allusion of "Nanguan" in the sentence "Crying of Nanguan out of thin air" comes from "Zuo Zhuan·The Ninth Year of Chenggong": Zhongyi from Chu was imprisoned in Jin Dynasty and still wore Nanguan. Playing southern music, Fan Wenzi praised it as a gentleman's trip. Later, ordinary literati used this to refer to their own moral prison life. For example, King Luo Bin of the Tang Dynasty "Singing Cicadas in Prison": "The cicadas sing in the West, and the guests in the South are thinking about invasion."; Li Bai's "Liu Yelang Hearing Unpredicted": "The hymn in the North is too prosperous, and the gentlemen in the South are wandering around."; Song Dynasty Wen Tianxiang's poem "Zhenzhou Zafu": "Twelve boys go out at night and catch Nanguan everywhere at dawn." The poem "Nanguancao" and "Farewell to the Clouds" written by Wanchun in the late Ming Dynasty and Xia Dynasty: "I have been a tourist for three years, and today I have Nanguan again." ." are all using this allusion.
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