随着老师的手指按下播放键，一阵优美的钢琴声便从录音机中传出。
With the teacher's finger to press the play button, a beautiful piano sound is coming from a tape recorder.
主要研究了钢琴声音幅度谱中的第七、第九次谐波对钢琴音质的影响。
The focus of the paper is on how piano timbre changes with the attenuation of the 7th and 9th harmonics amplitude of piano.
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