As soon as the word begins, it presents the scenery of late spring. The author's sight begins with an apricot tree: the flowers have withered, the little red is fading little by little, and the green apricots are beginning to bear fruit on the branches. "Residual red" means that there are not many red flowers left. The word "light" is deepened, which not only costs less, but also is light and more emotional.
three