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The envelope of sound spectrum is related to the transfer function of bore.
声频谱包络的特点和音管的传递函数有相应的关系。
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They may also transfer the thrust to sound rock at a low elevation.
他们也可以将推力传到高程较低的良好岩石上。
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They may also transfer the thrust to sound rock at a low elevation.
他们也可以将推力传到高程较低的良好岩石上。
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