n.
a set of two similar things considered as a unit
同义词：brace
two items of the same kind
同义词：coupletwosometwainbracespanyokecoupletdistichduoduetdyadduad
two people considered as a unit
a poker hand with 2 cards of the same value
On the use of concordant pairs in matched case-control studies
Infantile autism: a genetic study of 21 twin pairs.
Methods for producing members of specific binding pairs
Adhesion forces between individual ligand-receptor pairs.
Caries Experience amongst Somali Mother-Child Pairs: A Cross-Sectional Study
Ionic Association. III. The Equilibrium between Ion Pairs and Free Ions
Facilitation in recognizing pairs of words: evidence of a dependence between retrieval operations.
Facilitation in recognizing pairs of words: Evidence of dependence between retrieval operations. Journal of Experimental Psychology,...
Discussion of Application Principles of Traditional Chinese Medicine Herb Pairs in Different Types of Insomnia
The Implementation of Collaborative Cooperative Learning Model of Fun N Pick and Pairs Compare to Improve Students Motivation and Le...
