a couple of days和couples of days的区别是什么

a couple of days和couples of days的区别是什么 couples of 和 a couple of 的区别 a couple of days couple of days In A Couple Of Days 歌词 staying indoor for a couple of days. a couple of days.是指几天? It snowed a couple of days ago. 用a couple of days造句 a few 和 a couple of 的区别是什么? a couple of days 是两三天吗? a couple of days 有这个说法吗?