There are three chapters and eight sentences in each chapter of the whole poem, all of which begin with "Foundation" and "Millennium". What's the role?

The whole poem is about a man's yearning and pursuit of women, his anxiety and joy that he can't get. Sword Armor takes water, reed, frost and dew as images, creating a hazy, fresh and mysterious artistic conception. 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 uniqueness of autumn colors, and repeatedly depicts and renders the empty and sad atmosphere in late autumn, so as to express the poet's disappointment but ardent yearning for his friends. 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.