Unverified80% confidenceDecision RuleTime unknown
调音稳定性看弦钮：全封闭式镀铬调音旋钮比开放式塑料齿轮走音慢，儿童琴优先选带金属封闭弦钮的，避免每天反复调音打击兴趣
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80%
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Long-term
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