What song did Yang Liuan see first when the flowers fell on the moonlit night?

Butterfly Flying should be selected from Warm Rain in Nalan's Ci. "Spring clouds blow away the rain from Hunan curtain, and the sticky butterfly is still alive." Falling Flowers and Moonlit Night are probably selected from Bai Juyi's Four Wonders. Can help laugh, hurt parting. "Swallowing time" probably means spring. If you have to explain it, the general idea can be explained as: there is such a beautiful and bright moonlit night, but every time flowers bloom and fall; Swallows fly in the season, and the meeting season is far away, just like Zhuang Zhou's dream butterfly is empty. Generally speaking, it is the original parting. After parting, the swallows care about each other in the season.