我发现,书店图书多,书架之间距离较小,有的老年人为了看下面的书不得不坐在地上。有没有一种查看图书的辅助设备,不用弯腰下蹲,站着就能看到低层的书,使老年人方便购书呢?我上网寻求帮助,当看到潜水艇时,心中一亮,艇中的士兵通过潜望镜来观察海上的情况。潜望镜是从下面看上面的景象,而我需要的是从 I found that there are many books in the bookstore, and the distance between bookshelves is small. Some seniors have to sit on the floor in order to see the book below. Is there any kind of auxiliary equipment for viewing books without squatting down and standing to see lower-level books, making it easier for the elderly to buy books? I sought help online, and when I saw the submarine, The soldiers in the field looked through the periscope at sea. Periscope is seen from below the top of the scene, and I need is from