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
My mummy got/ bought me a pair of new shoes.
我妈妈给我买了一双新鞋。
That's not the right way to hold a pair of scissors.
那样拿剪子不对。
A pair of oxen, yoked together, was used.
把两头牛用轭套在一起使唤。
He wore old jeans and a pair of sneakers.
他穿一条旧牛仔裤，脚蹬运动鞋。
The mechanic was wearing a pair of blue overalls.
机修工穿着一件蓝色工装连衣裤。
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