Sound may be assessed after measurement of an appropriate physical quantity that varies about an equilibrium position as the sound wave or vibration passes the measuring point.
声波或则叫震动通过测量点时会有一个平衡位置，声音的理特质近似地围绕着它上下波动，通过测量波动可以评估出声音大小。
Sound may be assessed after measurement of an appropriate physical quantity that varies about an equilibrium position as the sound wave or vibration passes the measuring point.
声波或则叫震动通过测量点时会有一个平衡位置，声音的理特质近似地围绕着它上下波动，通过测量波动可以评估出声音大小。
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