一双的英文：
a couple of
a pair of
pair

参考例句：

She has hazel eyes
她有一双淡褐色的眼睛。

He has a pair of trainers.
他有一双运动鞋。

She has hazel eyes.
她有一双淡褐色的眼睛。

He had an immaculate white shoes.
他有一双洁白的鞋子。

I have bought ice skates to learn to figure skate.
我买了一双花样刀来学习滑冰。

Her baby has bonny and bright blue eyes.
她的孩子有一双美丽而明亮的蓝眼睛。

Four eyes see moor Ethan two. ——Muller
两双眼比一双眼看得清楚。——米勒

He was a wiry, red-haired man with piercing blue eyes and a penchant for grandiose schemes.
他瘦削结实，红头发，有一双目光锐利的蓝眼睛，爱搞宏伟的计划。

aster looked in, green eyes brilliant as emeralds
埃斯特探头进来，一双碧绿的眼睛象翡翠那样闪着光亮。

In a shoe store, shoes of medium width turn over quickly, but a pair of narrow shoes may not be sold for years.
在鞋店里,中型鞋卖得特别多特别快,可是一双窄型鞋也许好几年也卖不掉。

couple是什么意思：
n. 对，双；配偶，夫妻；数个
v. 连接，结合；加上；性交；成婚

bayonet coupling
卡口式联结

It is not every couple that is a pair
成双并非皆配偶

Every couple is not a pair
同床异梦,貌合神离

The young couple decided to have a child.
小两口决定要个孩子。

The priest married the couple.
牧师为那对新人主持婚礼。

pair是什么意思：
n. 一双，一条；一对夫妇；并排驾车的两匹马；一对舞伴；敌对两党；对子；双桨艇
v. 使成对；为...配搭档，配合；组成一对一对；结婚

a pair of colour
国旗和军旗

two pairs of satellite chromosome
两对随体染色体

She wears a pair of glasses.
她戴着一副眼镜。

John is my pair.
约翰是我的搭档。

That pair of trousers is made of corduroy.
那条裤子是灯芯绒的。