What are the ancient poetic images of "Yan"?

There are some ancient poetic images about "Swallow":

"Swallows come to Xinshe, and pear blossoms lag behind Qingming" in Song Dynasty? Yanshu's "Po Zhenzi".

The orioles and swallows are spring and spring, the flowers and willows are real, everything is rich and rhyming." Yuan Dynasty author: Qiao Ji Genre "Tianjingsha? Jishi".

" Birds are singing in the fragrant trees, and swallows are carrying yellow willow flowers." Yuan Dynasty? Zhang Kejiu's "Man on the Railing? Late Spring".

Shi Dazu, a poet in the Southern Song Dynasty, even used swallows as his lyrics, in "Shuangshuangyan? Ode to Swallows" He wrote: "I still look forward to Diaoliang Caojing, but I still talk softly and can't decide. The floating flowers are blowing quickly, and the green tail separates the red shadow. "Extremely studied, the form and spirit are similar. The spring is bright and brilliant, the swallows are petite and cute, and the literati are sentimental. When spring passes, the poet will be infinitely sad.

In the Song Dynasty? Therefore, Ouyang Xiu had "The music and songs dispersed and the tourists left. , began to feel the spring sky. The curtains are lowered, and the two swallows return in the drizzle." "Picking Mulberries."

The flowers are blooming, and the swallows are blooming with new breasts." Wei Yingwu of the Tang Dynasty wrote "Meeting Feng in Chang'an".

In Cao Xueqin's "A Dream of Red Mansions", it is precisely because of Yanzi's affection that the husband changes his mind and the couple meet.

Guo Shaolan is lucky. Some unfortunate women used Yan to send letters, but they fell into the sea and there was no news at all, such as "Sad Yan leaves a red line on his feet, annoying Luan shadow idles around the fan"

(Zhang Kejiu? "Sai Hongqiu? Spring Love"), "With tearful eyes, I lean against the building and talk to myself. When the two swallows come, will they meet each other on the street?"

(Feng Yansi, "Butterfly Loves Flowers"), its sadness The pain and deep thoughts make people moved, and then shed tears.