A: Every time I go to the grocery¹, the clerk asks me if I save
            stamps. I always say no, but sometimes I get them anyway.
            B: Oh, never turn them down. You can always find someone who'll take
            them. People spend hours pasting them in little books, and when a
            book is full, they drive miles to a redemption center where the
            stamps can be traded for things like pillow² cases, or playing cards,
            or garden tools. But you have to save millions of them to get
            anything worth having.

            Notes
            Stamp 美国一些商店或超级市场送给顾客的(如邮票大小的)赠券。积到一定数量后可以换取实物礼品
            Clerk 售货员
            Turn them down-refuse them
            Redemption center 用赠券换取礼品的商店
            Trade-exchange

            A：每次我去杂货店，店员都问我是否收集赠券，我总是说“不”，不过有的时候我还是积下些赠券。
            B：啊，别丢掉它。你总会找到回收赠券的人。有些人花时间把赠券粘贴在小本子上，当一本贴满后，开几英里的车到回收中心去，在那儿可以用赠券交换像枕头套、扑克牌或修整花园的工具等东西。不过你得收集相当多张才能换回一些有重要价值的东西