a pair of 后面接表示由两部分组成物体，而且是复数名词，如：
a pair of glasses.一副眼镜。
a pair of shoes.一双鞋。
a pair of scissors.一把剪刀。
She clamped a pair of headphones over her ears.
她把一副耳机戴在两边耳朵上。
She burrowed in the drawer for a pair of socks.
她在抽屉里翻找一双袜子。
Another of his lucky finds was a pair of candleholders.
他另一个幸运的发现是一对烛台。
I was searching for a pair of grey gloves to go with my new gown.
我在找一副灰色手套来配我的新礼服。
He twisted her arms behind her back and clipped a pair of handcuffs on her wrists.
他把她的双臂扭到她的背后，把一副手铐扣在她的手腕上。
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