原物品存在的问题:当我们站在普通的书架前选择图书时,只有眼睛平视或略仰视的那几层上摆放的图书才可以看得清楚又舒服。其余那几层对读者的眼睛来说,或大或小都是一个斜面,所以就不方便看清,只好弯腰 The problem with the original items: When we stand in front of an ordinary bookshelf and choose a book, only the books placed on the top or bottom of the eye can be seen clearly and comfortably. The rest of the layers of the reader’s eyes, either large or small, is a slope, so it is not convenient to see, had to bend down