noun · a rhetorical device involving parallel sentence structures or coupled phrases

这副对联的对偶非常工整，意境深远。

noun · the mathematical, logical, or physical property of being dual or having a dual structure

线性规划中的对偶理论在经济学中有着广泛的应用。

noun · a partner in marriage; one of a married couple

在古代语境中，“对偶”一词有时指代配偶。