以下为句子列表：
英文: Either two thymine bases are lined up in just the right way to bond when the UV hits, or they're not.
中文: 当受到紫外线伤害的时候，胸腺嘧啶或者线性排列以正确的方式形成键或者不产生键。
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英文: Normal DNA consists of four bases - adenine, cytosine, guanine and thymine (known as A,C,G,T) - molecules that spell out the genetic code in pairs.
中文: 正常DNA由四种碱基组成──腺嘌呤、胞嘧啶、鸟嘌呤、胸腺嘧啶，这些分子以成对的方式组成基因的密码。
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英文: That means that whether or not two thymine bases are damaged depends on the position of the DNA during the extremely brief time required for it to absorb UV light.
中文: 这就意味者无论两个胸腺嘧啶是否受到损伤都要依赖于在吸收紫外线极端短的时间内DNA的位置。
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英文: The base ratio of 1:1 for the bases adenine and thymine and the bases cytosine and guanine was the first clue to the specificity of BASE PAIRING in the nucleic acids.
中文: 在核酸中的碱基配对高度专一性的原则决定了腺嘌呤与胸腺嘧啶，或鸟嘌呤与胞嘧啶之间的比值为1：1。
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英文: Then they timed the reactions that caused the new thymine bonds to form.
中文: 然后他们记录了产生新的胸腺嘧啶键形成的反应。
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