the pair of glassesThe glasses are not for Lucy. 为什么要用复数 a pair of glasses 呢

问题描述:

the pair of glasses
The glasses are not for Lucy. 为什么要用复数 a pair of glasses 呢

因为眼镜有两个啊镜片啊

因为一副眼镜由两片玻璃组成.