Unverified80% confidenceDecision RuleTime unknown
需要经常翻阅携带、书包挤压环境选硬壳（PU/纸板硬封）保护内页；追求轻量或平铺书写选软皮/软封
1
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80%
Confidence
Long-term
Relevance
-
First Seen
Sources
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