Literature Reference: Rain: 'Good rain knows the seasons, it falls when spring arrives.' — Du Fu, 'Spring Night's Joyful Rain'; Shu: 'The quiet girl is beautiful, waiting for me at the corner of the city.' — 'The Book of Songs, Bei Feng, Quiet Girl'.
雨: The life-giving rain that nourishes all things.
姝: Beauty and grace. A fair lady, embodying the elegance of blooming flowers and the virtues of wisdom, kindness, and propriety.
Meaning: Rain symbolizes nourishment and vitality, while Shu represents beauty and serenity, embodying gentleness, grace, and wisdom.