Perhaps miracles work best when they're minor.
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It’s not difficult to isolate the harmonics of a vibrating string and hear their individual pitches. Harmonics are very useful for tuning your guitar – here’s a handy guide for doing so. They are also the basis of the whole Western tuning system generally.，推荐阅读新收录的资料获取更多信息
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。新收录的资料是该领域的重要参考
it doesn’t seem like they’re particularly effective。新收录的资料对此有专业解读
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