In ancient poetry, sunset (sunset or sunset) is usually used to express a feeling of desolation, loss, vastness, depression, nostalgia and nostalgia. This kind of emotional expression often appears in the works of vagrants, homesick women, strong men and poets. For example, Li Shangyin's "The Sunset is Infinitely Beautiful, Buried by the Coming Night" in Leyuan Scenic Area expresses a feeling of desolation, depression and loss.
In short, in ancient poetry, the sunset is usually used to express a feeling of sadness, depression, nostalgia and homesickness.