The ancient poems describing swallows are as follows:

1. The fallen flower is independent, and the swift flies in both directions.

from: Lin Jiang Xian Meng Hou Lou Tai Gao Suo by Yan Jidao in Song Dynasty.

explanation: people are faint and independent in the falling flowers, and swallows fly in the breeze and drizzle.

2. There's nothing to do. It's like I've met Yan before.

from: Huanxisha, a new word and a glass of wine by Yan Shu in Song Dynasty.

Explanation: Flowers always fall, which makes people feel helpless. The deja vu Chun Yan is back.

3. In the old days, Wang thanked Tang Qian Yan and flew into the homes of ordinary people.

from: Wuyi Lane written by Liu Yuxi in the Tang Dynasty.

Explanation: Swallows under the eaves of Wang Dao and Xie 'an have now flown into the homes of ordinary people.

4. Several early warblers compete for warm trees, whose new swallow pecks at the spring mud.

from: Spring Trip to Qiantang Lake by Bai Juyi in the Tang Dynasty.

Explanation: Several early Oriole birds rushed to the trees facing the sun, and the newly arrived swallow was busy building a nest and carrying mud.

5. When the swallows come, the Xinhua News Agency, and the pear blossoms fall behind the Qingming Festival.

from: Spring Scenery by Yan Shu in Song Dynasty.

explanation: when the swallows came back to catch up with the social sacrifice, the pear blossoms fell and ushered in Qingming.

6. Swallows fly in the mud, and Yuanyang sleeps in the sand.

from: two quatrains by du fu in the Tang dynasty.

explanation: with the coming of spring, the soil melts and becomes soft, swallows nest with mud in their mouths, and couples of mandarin ducks fall asleep on the warm sand.