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infrasound

['ɪnfrəsaʊnd] 名词
技术 Infraschall m
infrasound Vibrations of the air at frequencies too low to be perceived as sound by the human ear, below about 15 hertz ['ɪnfrəsaʊnd] 名词
环境 Infraschall m
 英语 词库
infrasound ['ɪnfrəsaʊnd] 名词
军队 Very low-frequency sound which can travel long distances and easily penetrate most buildings and vehicles