Appreciation: In these two sentences, the poet described this beautiful scenery in an implicit way from different angles. Cui is new green, which is the color when everything recovers and germinates in early spring. With "singing", the sound of orioles gives people a crisp and pleasant feeling. In the early spring, pairs of orioles sang on the budding willow branches, forming a vivid picture full of festive atmosphere. While the oriole singing on the willow is a silent vitality, the next sentence describes the vitality of nature with a more obvious dynamic trend: Wan Li is clear and egrets fly in this fresh sky, which is not only a kind of freedom comfort, but also an upward struggle. The word "Shang" here is ingenious. These two sentences, with "yellow" lining "Cui" and "white" lining "Qing", are bright in color and full of vitality in early spring. The first two sentences also describe the cry of an oriole. The poet described this vibrant and colorful image of early spring from two angles of vision and hearing, and this colorful technique also added vitality to poetry. Furthermore, the first sentence said that the oriole sang on the willow, and the last sentence said that the egrets flew into the sky, which broadened the space a lot. From bottom to top, from near to far, the poet's tangible vitality filled the whole environment and showed the prosperity of early spring from another angle.