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read just one card in your shortened fragment of DNA请解答下这句话中

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read just one card in your shortened fragment of DNA请解答下这句话中的card是什么意思?
前文是这样的But for purposes of simplicity,I'm going to sequence a gene of just six letters.The problem is,what with DNA being so small,is that we can't read it directly.In other words,we can't see what the letters are.So we need an indirect way of reading the cards,
按照您所给的上下文,这里的card,应该是指原文的【a gene of just six letters仅有六个字母的基因】.也就是下文one card in 【your shortened fragment(碎片;片断或不完整部分) of DNA】你的缩短的DNA片段.