(Song Dynasty) Liu Yiyi was by the pond in Zuo Wei, and people closed their doors by the willows. Butterflies fall with flowers and swallows fly with water. Try to make friends, you will be surprised and laugh. The spring of the year has passed again, and leaning on a stick is oblique.
"Butterflies fall with flowers" describes the characteristics that butterflies are light and can fall with petals.
"Swallows flying in the water" describes the characteristics of swallows flying close to the water at high speed.