Why does Di Jiang complain about what the willow in the willow refers to?

Liu: The song "Folding Willow". In ancient poetry, willow is often used as a metaphor for farewell. Poem Xiaoya Cai Wei: "In the past, I was gone, and the willows were reluctant." In the Northern Dynasty Yuefu's "Blowing the Drum Horn Across", there is "Folding Yang Liuzhi", and the lyrics say: "If you don't catch the whip when you get on the horse, you will hit Yang Liuzhi instead. Dismount and play the flute, worrying about killing travelers. "

Willow originally means willow, because in spring, willow can fly, which easily causes the sadness of the ancients.

In China's ancient poems, "willow" is a common image with lingering feelings, and there are countless famous sentences that contain this image, such as "It is comparable to a willow, flying over a neighbor's sheep", "I once planted a willow Jiang Nanan and bid farewell to Jiangnan twice in spring. Think back to Qing Jiang 'an (Tang Bai Juyi's Memory of Jiangnan) and "The willow bend at the water's edge will bother you to fold one at once. Only the most pity, diligence blows to the hand "(Liu Yang, the champion of training, in Tang Dynasty)," Willow green sounds, singing on the Langjiang River "(Zhi Zhu Ci in Yuxi, Liu Tang)," I suddenly see the color of the willow, and regret to teach my husband to find a seal "(funeral march in Changling, Tang Wang)," Spring City flies all over the place. When the willow piles up with smoke, the curtain doesn't count "(Die Lian Hua by Ouyang Xiu in the Northern Song Dynasty)," The willow trees in Xicheng are tender in spring, moving away from sorrow, tears are hard to collect, and I still remember their feelings, and once returned to the boat for the department "(Jiangchengzi by Qin Guan in the Northern Song Dynasty)," The willow scars and the willow hates, and the spring scenery is divided into two parts "(Xue Yuan Angfu's" The willow green is raining three feet, and the cherry red is breaking a flute) Living everywhere in Lanradial. " (Qing Fei Xuan's Meng Xiang Ci) and so on.