Appreciate the characteristics of A Farewell to Cambridge with examples.

"That pool under the shade of elm is not a clear spring, but a rainbow in the sky, broken among floating algae and precipitated a rainbow-like dream." It is not only a description of the scenery, but also a kind of freehand brushwork, which integrates feelings with the scenery, and the scene is mixed, confusing and colorful. Between the floating algae at the bottom of the clear spring pool, the reflection of the elm tree stained with the sunset glow ripples out, which is as beautiful as fantasy, reminding the poet of the joy of that year. These beautiful, mottled colors and aquatic plants seem to be the precipitation of joy and ideals of the year, far away in the dream, but in front of us. Poetry is praised for its sentimentality and soft tone.