The feeling of parting. "The rain has not come for a long time" is a line from an ancient poem, which comes from "Farewell to the Ancient Grass" by Du Mu, a poet of the Tang Dynasty. This poem depicts a scene of long-awaited rain, in which the "Sizhao Bairui" refers to What is more important is that the grass and trees have turned white because of the long rain. The artistic conception of this poem in the whole poem is to express the feeling of parting and the nostalgia for the past years. The rain has not fallen, and the grass and trees in the wilderness have all turned white due to lack of water. Withering and whitening symbolize the scene of extremely sad things and the fading vitality. This just reflects the parting feeling in the poet's heart. The time of parting is like the withering of the grass and trees on the earth, sad and helpless.