a couple of hours是两小时还是口语的几个小时、两三个小时?

a couple hours 为什么不用 a couple of I am free for a couple of hours. I am free for a couple of hours. a couple of hours..A couple of hours later it is all over with.这里后面为什么要加个with,这个with是什么意思,可以不加吗. I take a couple of hours off this afternoon?这里的off是什么 词组? a couple of hours是两小时还是口语的几个小时、两三个小时? just spend a couple of quiet hours before heading home in the evening的翻译 practice a for couple i the of piano hours day every we talk for a couple of 只见过some hours,several hours,hours,就是没见过a couple of hours,我理解这句话意思是我们谈了好长时间,但为什么不用hours,而用了a couple of hours? a couple of a couple of a couple of weeks a pair of couple a couple of造句, a couple of a couple of a couple of 可以说a couple of couple?一对夫妇 可以说a couple of couple不啊?