pair後面跟單數還是複數？ pair後直接加名詞怎麼辦

pair後面跟單數還是複數？ pair後直接加名詞怎麼辦

pair自身可以是單數或者複數.但是pair of後面的名詞必是複數：a pair of shoes.
就是一把鉗子也是：a pair of pliers；
一條黑褲子：a pair of black trousers.
pair後面直接跟名詞組成片語時，要根據具體情況來定.如果是定語性片語，根據規則名詞用單數：
Pair Card Game
The system is modeled by the Hartree-Fock description of a pair electron interaction.
如果是名詞性片語，則單、複數要根據句子的重點來定：
The player places a base pair card from his hand into the sequence.
In case when a winning combination or a pair cards are drawn，these cards will be held automatically.
Lone pair electrons have a stronger repulsion than bonding pair electrons.