a pair of + [plural noun]
She bought a pair of shoes.
她买了一双鞋。
一对（人）；搭档；一条（裤子）；一副（眼镜）；一把（剪刀）；对子；双；对（一起干活的牲口）；双人赛艇（两名桨手）
two similar or identical things considered together; a set of two
两个相同或相似的事物成对出现；常后接of。
Two alike or identical things taken together; often followed by of.
一对；一双(相似事物的组合)
a set of two similar things considered as a unit
处于恋爱、伙伴或友谊关系中的两个人。
Two people in a relationship, partnership or friendship.
两个同类物品；一对
two items of the same kind
用于成对名词(常以复数形式表示多个实例,因为此类名词仅用复数,除非在某些技术语境中)。
Used with binary nouns (often in the plural to indicate multiple instances, since such nouns are plural only, except in some technical contexts).
一对人；夫妻或搭档
two people considered as a unit
一对配合工作的役畜,如共轭的牲口。
A couple of working animals attached to work together, as by a yoke.
扑克牌中两张同点数的牌(不能同时算作更大的牌型)。
A poker hand that contains two cards of identical rank, which cannot also count as a better hand.
两局比赛中均得零分(零蛋)。
A score of zero runs (a duck) in both innings of a two-innings match.
双人双桨赛艇。
A boat for two sweep rowers.
议会中不同政党或意见的两名成员,双方同意在特定问题上或特定时期内的党派议题上不投票。
Two members of opposite parties or opinion, as in a parliamentary body, who mutually agree not to vote on a given question, or on issues of a party nature during a specified time.
机械装置中两个相互约束相对运动的元件或物体；根据其允许的运动命名,如转动副、滑动副、螺旋副。
In a mechanism, two elements, or bodies, which are so applied to each other as to mutually constrain relative motion; named in accordance with the motion it permits, as in turning pair, sliding pair, twisting pair.
She bought a new pair of shoes for the party.
她为派对买了一双新鞋。
用法提示：pair表示成对的两只鞋，用作名词
The pair of friends have known each other since childhood.
这对朋友从小认识。
用法提示：pair表示两个人组成的单位
He couldn't find his reading glasses, so he bought a new pair.
他找不到他的老花镜，所以买了一副新的。
用法提示：pair表示由两个镜片组成的眼镜
She bought a pair of shoes.
她买了一双鞋。
The socks are sold in pairs.
这些袜子成双出售。
注意：'a pair of'作主语时，谓语动词通常用单数。
A pair of birds is sitting on the branch.
一对鸟正停在树枝上。
常用，可指两个人或物，但更常指情侣或夫妻；与pair可互换，但couple更强调关系。
通常指表演者、搭档或组合，不用于无生命物；语气较pair具体。
非正式，仅指两个人；不用于物品，使用频率较低。
专门用于狩猎语境，极少用于其他场合；与pair不可随意互换。
grammar · medium
易错句子They are a nice pair.
正确表达They are a nice couple.
中文“一对”可指人也可指物，但英语中“pair”通常指物品成对，指人时应用“couple”。
grammar · medium
易错句子I bought two pair of shoes.
正确表达I bought two pairs of shoes.
中文名词没有单复数变化，但英语中“pair”的复数是“pairs”，表示多个成对物品时需要加-s。
对于名词'pair'（一对），其反义词为'single'（单个的），表示单独的一个，不是成对的。
与 pair 同音但意思完全不同：pair 指一双或一对，pear 是一种水果。
couple 通常指人（尤其是情侣或夫妻），而 pair 可用于任何成对的物体（如鞋子、手套）。
一双鞋
I bought a new pair of shoes yesterday.
我昨天买了一双新鞋。
一把剪刀
Can you hand me that pair of scissors?
你能把那把剪刀递给我吗？
成对地；两人一组
The students worked in pairs on the project.
学生们两人一组做这个项目。
一副眼镜
She needs a new pair of glasses for reading.
她需要一副新眼镜来看书。
一对夫妻
The married pair celebrated their 50th anniversary.
这对夫妻庆祝了他们的50周年纪念日。
一对A
He won the hand with a pair of aces.
他凭一对A赢了这一局。
一名帮手
We need an extra pair of hands in the kitchen.
我们在厨房需要一名额外的帮手。
成对地，成双地
Students worked in pairs on the project.
学生们两人一组做这个项目。
（使）配对，结成对
The teacher asked the students to pair off for the activity.
老师让学生们两人一组进行活动。
一对苦命的恋人殉情
In Romeo and Juliet, Shakespeare describes the protagonists as a pair of star-cross'd lovers.
在《罗密欧与朱丽叶》中，莎士比亚将主角描述为一对苦命的恋人。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY, WORDNET.