1, the projection of the darkness of reality and the disillusionment of ideal in the poet's mind
Here, the poet metaphorically described the dark and dreary social reality at that time as a narrow and lonely "rain lane". There is no sound, no joy and no sunshine. The poet himself is such a lonely person, wandering in the rain lane. He is lonely with good hopes, a restless man and an unattainable ideal, a tragic theme with the characteristics of the times.
2. Explain that this is a lyrical artistic conception with strong symbolic color.
In Rain Lane, the image of the girl is tragic, and so is the image of the lyric hero, the wanderer (the lonely wanderer image runs through all Dai Wangshu's works). His pursuit is so noble and idealistic. The girl he expects has both a deep inner world and charming charm. He is not only kind, but also does not bow before difficulties and hardships. However, he himself is so hard to understand. He knows neither himself nor each other well. Maybe what he expects is always the image in his heart.