Pressure grooves books page through convenient, hard cover book Groove along the case-making, and books are back, this book covers and book block do disruption to extend the service life of books.
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- 不抬溝槽的冊不梢翻閱便當,軟皮書(shū)殼沿書(shū)槽翻動(dòng),而冊不梢的書(shū)背不動(dòng),這樣書(shū)不開(kāi)背與書(shū)芯不離不易分裂,放大冊不梢的擱置壽命。