There is dominant axis on the machine core of the recorder (it is an organic whole with flying wheel) , if use inadvertent, touch dominant axis the turn, will produce the trill that eliminates hard.

 
  • 录音机的机芯上有一根加工精度非常高的主导轴(与惯性轮为一体),假如使用不慎,将主导轴碰弯,将会产生难以消除的颤音。
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