Unverified80% confidenceDecision RuleTime unknown
球体直径应匹配手型:成人直径约5-6cm(近似鸡蛋大小)为通用尺寸,手小或儿童选4.5cm以下,过大的球无法完整包握会导致发力集中在指尖而非全掌
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80%
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Long-term
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