An overlay model of user knowledge can be represented as a set of pairs "concept - value", one pair for each domain concept.

用户知识的叠加模型可以用一个“概念-值”值对的集合来描述，其中每个值对用于领域中的一个概念。

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Eigen supposed a set of replicating RNA pairs of complements, each itself able to replicate as in the Orgel type experiments noted above.

艾根猜想一套成对复制的互补的RNA，其中每一个都能够像上文所述的欧高型的实验那样复制本身。

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The curly braces () indicate a hash table, which is a set of name and value pairs.

大括号()则表明这是一个散列表，该散列表由一组名称和值对组成。

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Embedded in each set of 23 chromosomes are 3 billion base pairs of DNA, known by the letters A, T, C and G, for the chemical bases adenine, thymine, cytosine and guanine.

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Mr Plomin has also set up a study working with 10, 000 pairs of identical and non-identical twins in Britain.

ECONOMIST: WHAT WE LEARN FROM TWINS

There are 23 pairs of human chromosomes and children get half a set from each parent.

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