1, the mud melts into a swallow, and the sand warms the sleep. -Du Fu's quatrains

Swallows are busy building nests with wet mud in their mouths, and couples of mandarin ducks are sleeping on the warm beach.

Although Haiyan is weak, spring will come. -Zhang Jiuling's "Return to Yanshi"

Although Haiyan is very small, it only temporarily returns to the north in spring.

3. Where did you fly to Shuang Yanzi? At that time, you were painting the west side of the beam. -Liu Cizhuang's "Looking at Peach Blossoms Shallow"

Where do a pair of passionate swallows fly, chasing red and wandering in the rain? Take a few petals of peach blossoms, put them in the west of the painting beam and taste them repeatedly.

4, helpless flowers fall, I seem to know the return of Yan, but I am alone. -Northern Song Dynasty Yan Shu's "Huanxisha New Words and a Glass of Wine"

I can't help it if flowers bloom and fall. The returning swallows are deja vu, wandering alone on the flower path in the small garden.

5. After Shuang Yan and Shuang Yan, flying together is enviable. -Double Yan Li by Li Bai in the Tang Dynasty.

Shuang Yan, flying freely in the sky, is really enviable.