Unverified80% confidenceTradeoffTime unknown
EVA泡棉磁力贴柔软安全但边缘易卷翘、易被抠咬掉渣；PVC/硬质磁片平整耐用但边角较硬。给3岁以下选EVA软材，给4岁以上练习书写选硬质平整片以保证擦写手感
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80%
Confidence
Long-term
Relevance
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