What was Du Fu's mood in the Tang Dynasty when he was in the night, beautiful mountains, beautiful spring breeze, flowers, fragrant mud, flying swallows, sand and warm sleeping mandarin ducks?

The spring breeze brings the intoxicating fragrance of flowers and plants.

The ice and snow on the beach melted, and the soil became wet and soft, attracting swallows to fly and build their nests with mud.

Couples of mandarin ducks are still snuggling on the warm beach.

The last two sentences of Du Fu's quatrains express the poet's deep and beautiful life interest and infinite affection for all things in nature and the mountains and rivers of the motherland.