He and his wife now have a pair of five-year-old twin sons.
他和妻子现在有一对5岁的双胞胎儿子。
In order not to be mistaken for his twin brother, Kevin wore a pair of glasses at the party.
为了不被误认为是他的孪生兄弟，凯文在聚会上戴了一副眼镜。
Each twin of a pair played the ultimatum game, both as proposer and as responder.
每对双胞胎中的每个人都参与了最后通谍游戏，都扮演了建议者和回应者。
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