If possible keep a spare pair of glasses accessible in case your main pair is broken or lost.

如有可能留一副备用眼镜以防你常用的那副打碎或丢失。

《柯林斯英汉双解大词典》

They carry on the tradition of giving back for every pair of socks sold, they give away a pair to those in need.

他们还继续着这一传统，每卖出一双袜子，就会向有需要的人赠送一双。

youdao

I have a pair of small eyes, a big nose and a pair of big ears.

我有一双小眼睛，大鼻子和一对大耳朵。

youdao

But,she later woke up. The first thing she asked for was a pair of scissors so she could start another paper creation.

VOA: special.2010.04.14

A covalent bond is any time we have a pair of electrons that is shared between two different atoms.

所谓共价键就是我们有两个原子,共用一对电子。

麻省理工公开课 - 化学原理课程节选

and they bought every single one of these guests a pair of new shoes for a party favor.

而且他们给每个参加聚会的人买了一双新鞋。

富家孩子的生日 - SpeakingMax英语口语达人

More venerable abodes are fronted by thick red doors outside of which perch either a pair of lions or a pair of drum stones.

BBC: Old Beijing at its timeless best

Thus, you might fold if you were holding a pair of threes and a pair of tens and you believed your hand had only a 30% chance of winning.

FORBES: Busted

As of now, I'm using a basic pair of Sony sport headphones, but is there a pair of moderately priced ear-buds that do the trick of actually staying in your ear while running?

ENGADGET: Ask Engadget: best earbuds for fitness use?