a pair of 和 pair of 用法的区别在哪里?

a pair of shoes a pair of couple a pair of a pair of Need a pair of pair of pair of a pair of gloves还是a pair of glove 是a pair of glass 还是a pair of glasses a pair of skate还是a pair of skates a pair of glasses复数 a pair of trousers是什么意思 a pair of shoes中文 a pair of的中文翻译 a pair of gloves是什么? Here___ a pair of trousers a pair of spectacles是什么意思 a pair of sunglasses(中文)