1·This article's examples use DNA, which consists of two strands of adenine (A), cytosine (C), thymine (T), and guanine (G) nucleotides.
本文的示例使用 DNA，DNA 由腺嘌呤（A）、胞嘧啶（C）、胸腺嘧啶（T）和鸟嘌呤（G）组成的核苷酸双螺旋组成。
2·Then they timed the reactions that caused the new thymine bonds to form.
然后他们记录了产生新的胸腺嘧啶键形成的反应。
3·Adenine and guanine are purines and cytosine and thymine are pyrimidines.
腺嘌呤和鸟嘌呤是嘌呤和胞嘧啶和胸腺嘧啶是嘧啶。
4·The only difference is that in the RNA copy, thymine is replaced with the closely related base uracil, commonly abbreviated u.
唯一的区别在于，在RNA复制中，胸腺嘧啶被密切联系的、常被缩写为U的碱基尿嘧啶替换。
5·Thymine: Organic compound of the pyrimidine family, often called a Base, consisting of a ring containing Both nitrogen and carbon atoms, and a methyl group.
胸腺嘧啶：一种嘧啶类有机化合物，通常叫做基底，由含有氮和碳原子以及甲基的环形物组成。