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It can help you put the book back accurately to the original location when you are reading in the library or at home. The triangular shape is designed to help you more easily achieve the goals. First of all it replaces the location of the book, when finishing reading the book it can easy to help you put the book back to its distraction, and then remove the "v", the bookshelves are back to neat state.
Yunjiao_Xie, Fengjuan_Zhu, Xin_Sun, Na_Li