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Bookmark‘s slot can be adjusted at any time according to the thickness of pages have been reading.It can be made of any type of folding and also can be used as a small mat to support the book.Proper inclination can protect vision health.
Hunan University
Changsha, China
Hunan University
Changsha, China
Xueqi Zhou / Shuqi Wang / Jianxun Lai / Ruoshi Zhuang
