Unverified90% confidenceDecision RuleTime unknown
3岁以下幼儿优先选笔身粗短(直径≥25mm)、笔头圆润无缝隙、防口水浸入(IPX等级或全封闭结构)的机型，避免细长笔身导致抓握困难和误吞风险
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