Allusions about folding willows?

The etymology of the word "Zheliu" first appeared in the Song of Zheliu written by Han Yuefu. Instead of grasping the whip, it folded Yang Liuzhi. Later generations used folding willows to hide their feelings of leaving home, and there was also a trace of homesickness in this nocturne. Who can't afford to be homesick? (Li Bai, who heard the flute in Los Angeles on a spring night) Why should Qiangdi complain about the willow? The spring breeze is insufficient. (Wang Zhihuan's Liangzhou Ci)

The word "folding willow" means "Farewell to the distant future": in ancient China, once relatives and friends separated, travelers were always given a willow when they said goodbye. The word "folding willow" means "farewell". China's custom of "folding willows to bid farewell" was first seen in China's first collection of poems, Xiaoya. Cai Wei: "I have been there, Yangliuyiyi; When I think about it today, it's raining heavily. In ancient times, willow was also called Xiao Yang or willow. Because "Liu" and "Liu" are homophonic, they can express the meaning of retaining. Giving someone a willow means inseparable, reluctant and reluctant. There is a song "Breaking Yang Liuzhi" in Yuefu in the Northern Dynasties, and the lyrics are: "If you don't catch the whip when you get on the horse, you will hit Yang Liuzhi instead. "