What role does the environmental description of necklaces in Gu Yan's poems play?

Image: The lone goose flies alone in the drizzling dusk rain, hovering over the quiet and cold pond, but hesitating whether to get off or not, for fear of distress.

Purpose; Through the description of the image of the lonely goose, the lonely feelings are expressed.

The first couplet describes the background of "going out of the group", comparing "walking" with "independence", highlighting the loneliness of the lonely goose and also writing the poet's sympathy. Zhuan Xu wrote about the reasons for losing the group and the hasty performance after losing the group, which not only described the natural environment at that time, but also described the expression state of the lonely goose. The lonely geese flying in the clouds, flapping their wings with the moon, are still helpless. Desolate and lonely.