Sunset is the sunshine when the sun is about to set, that is, sunset. It is cold and cheerless, not only because it is cold compared with the noon sunshine, but also because of the author's mood, which will be explained later. The willow in China's poems generally contains the meaning of parting. The ancients had the custom of breaking willows to bid farewell to express the meaning of parting. A tree embodies the meaning of loneliness, and the willow stands there alone, paying attention to the picture of the author (if it is from the author's point of view, it is just a tree). His situation at the moment is as lonely, lonely and cold as that willow tree. The whole sentence is full of scenery and lyricism.

It just sets off the loneliness and loneliness of the author. If the whole poem is related to farewell, there is also attachment and reluctance to friends. Writing about scenery and expressing feelings is ostensibly about scenery. In fact, what kind of feeling the scenery gives people is the feeling in the author's heart.