purine cytosine uracil thymine adenine guanine
嘌呤胞嘧啶尿嘧啶胸腺嘧啶腺嘌呤鸟嘌呤
There are just four kinds adenine, thymine, guanine and cytosine.
只有4种腺嘌呤, 胸腺嘧啶, 鸟嘌呤和胞核嘧啶。
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。
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。
The other two, thymine and cytosine, are single ring structures called pyrimidines.
另两个为胸腺嘧啶和胞嘧啶，即称为嘧啶的单环结构。
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