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骨子裏是YAMAHA的ETERNA鋼琴
這琴有點怪，裹面裝着一個印有 Yamaha 字樣的琴膽。琴槌如是，印有 Yamaha 的字，連鋼琴序號數字及字體都印得似模似樣。
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Humidity Changes
One reason for piano to go out of tune is rapid change of relative humidity.
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