Read Edit View history 嘧啶 mìdìng pyrimidine Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 嘧啶 · mìdìng · pyrimidine 2026/03/04 嘧啶 mìdìng pyrimidine pyrimidine C4H4N2 嘧啶和嘌呤是构成核酸的主要碱基。 noun created sense Mar 4, 2026, 02:25 AM