我经常在晚上散步,因此我发现不少的电线杆上、树上、集贸市场广告栏上以及大小门面两边的墙上,贴满了不同内容、形式的广告。我开始留意这些广告,并在本子上记下“供方”有哪些货要出手,“购方”需要哪些物品,并从中发现了一些规律。旧电子产品在校园区我常常在学生宿舍区宣传栏上看到电脑、电视机、随身听、手 I often take a walk in the evening, so I found that many of the poles, trees, bazaars and billboards on both sides of the wall, covered with different content, forms of advertising. I began to pay attention to these advertisements, and in the book, I wrote down the items that the supplier should sell, the items that the buyer wanted, and discovered some laws. Old electronic products in the campus I often see in the student dormitory area bar computer, TV, Walkman, hand