a couple of years

a couple of years 英语翻译that happened a couple of years of years ago.这里的a couple 请问：“a couple of years”和“a couple of year”分别是什么意思?其中有错么? “A couple of years”到底是指几年? 可以说a couple of couple? a pair of couple a couple of a couple of hours.. 关于a couple of .. in a couple of a couple of days 英语翻译We take 18-year-old kids,give them a couple of years of