Unverified85% confidenceTradeoffTime unknown
珠子越大越安全但精细动作锻炼价值越低:大颗粒(≥2cm)适合安全启蒙但很快玩腻,小颗粒(1cm左右)更能锻炼捏取但需3岁以上且全程监护
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85%
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Long-term
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