Willow: In ancient poetry, willow is universal, generally referring to willow.
Yiyi: gentle eyes. The ancients bid farewell, exchanged gifts and said goodbye. Metaphor is reluctant to leave feelings.
Other ancient poems describing spring:
Two Night Scenes by the Hui Chong River/Two Small Scenes by the Hui Chong River
Author Su Shi, Song Dynasty
Two or three peach blossoms outside the bamboo forest and ducks in the water first noticed the warm spring.
The beach is covered with wormwood, asparagus is beginning to sprout, and puffer fish are preparing to swim upstream from the sea back to the river.
Translation:
Two or three peach blossoms are blooming outside the bamboo forest, and ducks are swimming in the water. They first noticed the warming of the river in early spring. The beach has been covered with Artemisia selengensis, reeds have begun to sprout, and puffer fish are about to swim from the sea to the river.