The first two sentences of each chapter of the poem are used vividly. What's the role?

The poem "Jiaxu" is to project the unique scenery of late autumn with the euphemistic and melancholy lovesickness feelings of the characters, thus rendering the atmosphere of the whole poem and creating a confusing and patchwork artistic conception. This poem creates a hazy, fresh and mysterious artistic conception with images such as water, reed, frost and dew. The morning mist covers everything, and the crystal dew has condensed into frost. A shy girl walked slowly. The water image in the poem represents women and embodies the beauty of women, and the thin mist is like a veil covered by a girl. She appeared at the water's edge, and then on the land of water. I can't find it, and my anxious and helpless mood itches like an ant crawling and hurts like a knife cutting. As we often say, "distance produces beauty", this kind of beauty becomes hazy, fuzzy and unclear because of distance. The identities, faces and spatial positions of the protagonist and the Iraqi people are vague, giving people a vague, looming and hazy feeling. Sword armor, white dew, Iraqi people and autumn water are becoming more and more elusive, forming a hazy and elegant watercolor painting. At the beginning of each chapter of the poem, the brushwork of seeing interest in fu is adopted. Through the description and admiration of the real scene in front of me, I drew an ethereal artistic conception that enveloped the whole article. The poet grasps the unique characteristics of autumn, and repeatedly describes and renders the empty and sad atmosphere in late autumn with heavy colors, so as to express the poet's loss and ardent admiration. The first two sentences of each chapter are inspired by autumn scenery, which leads to the text. It not only points out the season and time, but also renders the desolate atmosphere, which sets off the melancholy mood of the characters and reaches the artistic situation of blending scenes. The three images of "Jiaxu", "Water" and "Arbitrary" complement each other and blend into one, and the things for fun and the things described constitute a complete artistic world. At the beginning, the scene of reeds growing by the water in autumn is exactly "expressing meaning with images" and has the role of "passion" Because of the reed, and under the reflection of the sky and water, it is bound to present a state of confusion, showing the realm of "hazy love" in the hero's heart from one side. The rich aesthetic feeling contained in Jiaxu is worthy of our attention and serious discussion, both from the perspective of appreciation and creation.