Read Edit View history 尿嘧啶 niàomìdìng uracil Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 尿嘧啶 · niàomìdìng · uracil 2026/03/04 尿嘧啶 niàomìdìng uracil uracil (U), a nucleotide base that pairs with adenine (A) in RNA 尿嘧啶是构成RNA的四种碱基之一。 noun created sense Mar 4, 2026, 02:25 AM