Unverified80% confidenceDecision RuleTime unknown
笔芯直径3.3mm以上（如乳白木彩铅）比标准2.9mm更抗摔，低龄儿童选粗芯可显著降低折断率；同时选木质外壳松软易削的品类
1
Sources
80%
Confidence
Long-term
Relevance
-
First Seen
Sources
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