[KongchangAI]
Unverified70% confidenceTradeoffTime unknown

难度递进过陡与过缓存在权衡:递进太快孩子频繁受挫放弃,太缓则无成就感感到无聊,理想设计是每完成5-8页提升一个小台阶,让正确率维持在70-85%区间

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70%
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Long-term
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