[KongchangAI]
Unverified82% confidenceDecision RuleTime unknown

材质硬挺度选择:加硬EVA夹层或硬质帆布(克重≥12oz)能防止书本卷边变形,适合频繁携带;软棉布/无纺布袋虽轻便但书本易折角

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