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Acoustic-–studies the physical properties of speech sounds , the way sound travel from the speaker to the hearer. 聲學(xué)語(yǔ)音學(xué)研究語(yǔ)音的物理性質(zhì)，研究語(yǔ)音從說(shuō)話者到聽(tīng)話者之間的傳播方式。