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Using some bookcases with double layers has advantage and disadvantage. The advantage is that the row in the front and back row can store more books. The problem is that the books in the back row are blocked by that in the front row, which is very inconvenient for finding and accessing. Drawer bookcase optimizes the existing bookcase with double layers, and designs the back row into the drawer that could be stretched left and right.While needing to find the rear books, only pull out the drawer, and then you could have access freely. At the same time, this way is also convenient for classification and managements of the books.