Jiangshan is bathed in spring, how beautiful it is. Spring breeze brings the fragrance of flowers and plants. Swallows are busy building nests with wet mud in their mouths, and couples of mandarin ducks are sleeping on the warm beach.
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The poet chooses the most common and distinctive dynamic scenery in early spring to sketch. In spring, the flowers bloom, the soil melts, the soil is wet, and the swallows that come from autumn to spring are busy flying around and building nests with the soil.
This vivid description makes the picture more vibrant, full of the breath of spring, and has a dynamic beauty. Du Fu's observation of swallows is very detailed, and "mud melting" is closely related to the first sentence, because spring returns to the earth and the sun shines brightly, which is "mud melting"; The new Yanzi made a nest out of the mud in his mouth and kept flying, showing a feeling of spring.