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| poddźwięk (drgania powietrza o częstotliwościach zbyt niskich by człowiek mógł je odbierać jako dźwięk; Vibrations of the air at frequencies too low to be perceived as sound by the human ear, below about 15 hertz) | |||
| infradźwięk m | |||
| English thesaurus | |||
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| Very low-frequency sound which can travel long distances and easily penetrate most buildings and vehicles | |||
