I saw the role of the sunset in describing the scenery that reflected the smoke floating in the wilderness.

When the sun goes down, it is at night. This sentence is a description of the scenery. The role of scenery description is generally to point out the time, render a certain atmosphere, and integrate feelings with scenery. This sentence points out that the time for wandering homesick is in the evening, which renders a sad atmosphere.

The author integrates emotion into the scene and embodies emotion in the scene. On the surface, Running Water on a Bridge gives people a fresh and elegant feeling. Bridge is a small bridge, water is running water, and home is the home where people live. Describing the beautiful scenery in the south of the Yangtze River is actually a common contrast technique in Chinese poetry. It contrasts the sadness of the music scene with the melancholy that makes people homesick.