Classic Allusions in Chinese Ancient Poems

If we know the meaning of allusions in advance, then the allusions will enhance our understanding of ancient poems. If we do not understand the meaning of allusions, then the ancient poems will be even more difficult for us!
Cold food:

Festival name, one or two days before Qingming Festival.

Legend has it that Jiezi of Jin State lived in seclusion in the mountains, and Jinwen used the method of burning mountains to force him to become an official, but Jiezi could not be pushed and burned to death. To commemorate Jie Zitui, Jin Wengong prohibits raising fire on the day of his death and only eats cold food. This section comes from here.

"Cold Food" by Tang Hanhong: "Flowers fly everywhere in the spring city, and the cold food is slanted by the east wind and the willows."
moon:

Generally refers to homesickness, such as "Looking up at the moon and looking down at hometown" in Li Bai's "Quiet Night Thinking", "The small building was windy last night, and the homeland is unbearable to look back at the moon" in Li Yu's "Poppy Yu".

Yangliu: Because "liu" and "stay" are homonyms, they generally refer to parting. For example, in Liu Yong's "Yulin Ling", "Where to wake up tonight, the bank of the Yangliu, the dying wind and the moon", in addition, Yangliu can also refer to homesickness. For example, in Li Bai's "Wearing the flute in the Spring Night in Luocheng", "Who can't afford the love of the homeland" in this nocturne.