What are the artistic features at the beginning and end of Rain Lane, and what effect does this expression have on the poet's thoughts and feelings?

A Jiangnan girl and "I" met and floated in the rain lane. In the waiting of "I", she appeared and floated like a clove, and then dissipated in the "elegy of the rain". Meeting is just imagination; Passing by is an inevitable tragedy. In the fragmentary words, "she" and "I" appeared, while "I" watched her disappear as if it were a dream. The poet, holding an oil-paper umbrella, wandered in the lonely rain lane, fantasizing about meeting a girl he hoped to meet. This is not a real meeting, but an imaginary meeting. The girls in the south of the Yangtze River, like lilacs, may be the girls of the descendants of the prime ministers of the former Qing Dynasty, or the girls next door to the former poets. In fact, it doesn't matter who she is, she will eventually disappear from the poet's sight. This is a beautiful lyric poem. Against the strong symbolic color, it reflects the poet's tortuous inner world naked, and presents a gloomy picture scroll of Jiangnan alleys in the rainy season with deep and beautiful colors. With sadness, the poet puts himself in a long rainy lane and becomes a lonely man who wanders repeatedly. There is no sound, no joy, no sunshine, only hesitation and sadness. This is a narrow and lonely "rain lane", and it was also a dark and depressing social reality at that time. He has a beautiful hope in loneliness, hoping that his beautiful ideal can be realized. However, the poet clearly knows that good wishes are difficult to achieve. The result is fleeting, leaving yourself wandering in the dark reality. Here, the poet's complex emotions of being unable to grasp the ideal and unwilling to give up the ideal are fully revealed. Wandering in a long and lonely rain lane with an oil-paper umbrella, the poet walks alone in the rain lane; And his vacillating gait clearly reveals his inner loneliness and anguish. Alleys, drizzle, the lonely poet with an oil-paper umbrella, and his wandering gait-these are the first few words of this poem that show us. After the above lens, a poet's inner monologue appeared in the poem: I hope to meet a girl as sad as lilac. This "lilac girl" is not a real person in the real world, but a virtual person imagined by the poet (he hopes to meet). What kind of girl is this? The poem goes on to say: she has the same color as lilac, the same fragrance and the same sadness. Lilacs bloom in mid-spring, and the color is white or purple, giving people a feeling of weakness, beauty, purity and solemnity. Lilacs are beautiful, but they wilt easily. The ancient poets in China often hurt spring when watching lilacs, saying that lilacs are the cause of concern. In China's ancient poems, there are many famous sentences chanting lilacs, such as: "The bluebird doesn't spread the news outside the cloud, and lilacs are sad in the rain" ("Huanxi Yarn" by Li Can in the southern Tang Dynasty); "lilacs are weak, and the branches are still falling"; "Bananas don't show lilac knots, and the spring breeze is sad in the same direction"; Wait a minute. Due to the repeated chanting and widespread singing of ancient poets in China, in the eyes of China people (especially literati), lilacs have gradually become a symbol of things with this nature, such as beauty, nobility, weakness and sadness. The "girl" in Rain Lane is a female image endowed by ancient poets in China with the above attributes ── she has the graceful posture and color of lilac, the noble and fragrant characteristics of lilac, and the sad characteristics (endowed by ancient poets). Such a lilac soul-like "girl" seems to have her own life after being created by the poet's imagination. In the poem, she also moves like a real person: she wanders in this lonely rain lane, holding an oil-paper umbrella like me. Like me, silently sad, indifferent, sad and melancholy. In the rain lane written in the poem, only the poet walks alone; Since the "Lilac Girl" appeared, there have been two people walking in it; And the girl's gait, expression, and even the oiled paper umbrella in her hand are all like a poet. The appearance of such a person obviously filled the poet's heart with expectation and hope. In Long and Lonely Rain Lane, there are two lonely young men and women now, so what will happen next? This is what we want to know, and it is exactly what the poet wanted to know at that time. The poem continued: She silently approached and took a breath. She floated like a dream, dreamlike, sad and confused. She finally approached the poet, (we can imagine the poet's heartbeat at the moment), but she didn't say hello to the poet, just cast a sighing look at the poet, and then floated past without a trace like a dream! (We shout in our hearts: Why is this so? When she drifted past the poet, the poet saw that her expression was sad and confused. This expression clearly reveals that she is actually unwilling to be separated from the poet. But for some (unclear) reasons, she had to miss the poet! As the saying goes: life is a rare confidant! What a pity that these two young men and women (even with the same expression and gait) accidentally missed each other in the rainy lane! How sad it is for the poet to miss a possible beautiful marriage like this. In the emotional state of being reluctant to go, the poet watched the "Lilac Girl" drifting away in the rain lane: like a lilac field drifting in a dream, I drifted over this girl; She walked away silently and walked towards the crumbling fence. Walk through this rainy path. Walking through a "broken fence" is a concrete symbol of the disillusionment of the poet's desire to get together with "Lilac Girl", and "Lilac Girl" finally disappeared at the end of the rain lane. But at this time, the poet is still in a state of distraction. Even if he never sees "Lilac Girl" again, he is still feeling the dim light left by "Lilac Girl" in the rain lane, feeling the color and fragrance in the cold air, and he is sad for the continuous dissipation of this color and fragrance: in the elegy of rain. She lost the color, dispersed the fragrance and dissipated, even her sighing eyes and the melancholy of lilac. (We can imagine:) The poet stood alone in the rain lane, remembering for a long time the color, fragrance and even her sighing and melancholy eyes when she met Lilac girl just now. But the cruel reality can't tolerate beautiful love or ideals. At the end of the poem, we can see that in the "long and lonely rain lane", only the poet is wandering alone: a person is wandering in the long and lonely rain lane with an oil-paper umbrella, hoping to float past a girl with a lilac knot. At the end of the poem, the poet seems to repeat the scene that appeared at the beginning of the poem. The first two paragraphs are almost the same, except that "(I hope) meet" is changed to "(I hope) float". This change, on the one hand, shows that the poet has not completely given up hope, on the other hand, it also makes people feel that the poet's hope is getting more and more slim. Therefore, after reading the last verse of the poem, we can't help feeling that the irretrievable depression, sadness, helplessness and melancholy expressed in the poem have deepened. ......