| 摘要 |
The present invention is essentially comprised of a pair of spaced-apart planar book support elements joined by a hinged spine support element that accommodates the book spine, a pair of book holder slope support elements that are each joined by a hinge to the top edge of a respective book support element, and a closed cord loop element that adjustably co-operates with the lower extremes of each book support element and each slope support element to controllably vary the slope of the planar book support elements during reading use.
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