The case and control subjects were matched by age (1:1 pair-wise matching).

病例组和对照组在年龄上相匹配(1：1逐对匹配)。

youdao

The ventral nerve cord of the crab in the embryo included 1 pair mandibular neuromere, 2 pairs neuromeres of maxillae, 2 pairs neuromeres of maxillipede and abdomen nerve cord.

三疣梭子蟹胚胎期腹神经链由1对大颚、2对小颚和2对颚足所对应的神经节以及腹部神经链组成。

youdao

Listing 1. Class constructed from pair of strings.

从一对字符串创建的类。

youdao

And if we put that in our bond here, we have 1, 2, 3 bonds, plus we have one lone pair left over.

如果我们把它们放到键里，我们有1，2，3个键，还剩下一对孤对在这里。

麻省理工公开课 - 化学原理课程节选

But if my pair chooses Beta then Alpha yields -1, Beta yields 1: in this case Beta would be better.

但是要是我对手选β我选α得-1,选β得1,此时选β更好

耶鲁公开课 - 博弈论课程节选

or 1 lone pair, 2 lone pair electrons.

或者说一对孤对电子，两个孤对电子。

麻省理工公开课 - 化学原理课程节选