noun 下载 🔗分享 嘧啶 A diazine in which the two nitrogen atoms are in the meta- positions; it is the basis of three of the bases found in DNA and RNA: thymine, uracil and cytosine Examples : "In biology class, we learned that cytosine, thymine, and uracil, three important building blocks of DNA and RNA, are all types of pyrimidine bases. " 在生物课上，我们学到胞嘧啶、胸腺嘧啶和尿嘧啶这三种DNA和RNA的重要组成部分，都属于嘧啶碱基。 biochemistry biology chemistry compound 与AI对话词汇游戏阅读练习
