Unverified82% confidenceTradeoffTime unknown
珠子越大越安全防误吞,但大珠子难以训练精细动作和三指抓握;小珠子(1-1.5cm)精细训练效果好但仅适合4岁以上且有看护,需在安全与训练价值间权衡
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82%
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