We practiced English conversation in pairs so that both of us can make progress.

我们两人一组练习英语对话，这样我们两个人都能进步。

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This device could make it possible to manufacture electroluminescent diodes of entangled photon pairs, with rates close to one gigahertz (in other words around on billion Hertz).

此装置可以让人们有可能制造频率接近1千兆赫(10亿赫兹)的纠缠光子对电致发光二极管。

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When in a new city, make sure you travel in pairs. Don't take your surroundings for granted.

当身处一个陌生城市的时候，不要单独行动。不要对周围的环境想当然。

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The genome project, which the government began in 1987, aimed to speed the gene-hunting effort by providing the first full map of all 3 billion base pairs that make up human DNA. (It was not necessary, in this effort, to run through all the pairs on each set of chromosomes, or 6 billion pairs.) And because the base pairs come in only four varieties, they are digital and ideal for computer decoding.

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Children who were tutored in pairs and groups of three appeared to make just as much progress as those taught on a one-to-one basis.

BBC: Poorest pupils 'weaker at maths'

Both are digital systems, in which words or base pairs are recombined to make an infinite possibility of messages. (Elsewhere I once noted the numerical similarity between Shakespeare's vocabulary of about 20, 000 distinct words and his genome of about 21, 000 genes).

WSJ: Matt Ridley on the Ideas in Mark Pagel's Wired for Culture | Mind & Matter