【pair】pair后面跟单数还是复数?pair后直接加名词怎么办

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【答案】 pair自身可以是单数或者复数.但是pair of 后面的名词必是复数：a pair of shoes.
　　就是一把钳子也是：a pair of pliers；
　　一条黑裤子：a pair of black trousers.
　　pair后面直接跟名词组成词组时,要根据具体情况来定.如果是定语性词组,根据规则名词用单数：
　　Pair Card Game
　　The system is modeled by the Hartree-Fock description of a pair electron interaction.
　　如果是名词性词组,则单、复数要根据句子的重点来定：
　　The player places a base pair card from his hand into the sequence.
　　In case when a winning bination or a pair cards are drawn,these cards will be held automatically.
　　Lone pair electrons have a stronger repulsion than bonding pair electrons.