不同频率的低频声波在底质中的吸收衰减各不相同。

Sound wave consists of different frequency, and the sound wave's attenuation is variety in many different sediments.

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另一种与闹鬼相关的自然现象是称作次声的低频声波。

Another haunted and related natural phenomenon is known as frequency infrasonic sound waves.

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经采用低频声波清灰装置，减少了检修和维护的费用。

Expenses for repairing and maintenance were reduced after the low frequency sound wave deashing device was used.

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