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infrasound ['ɪnfrəsaʊnd] n
gen.	不可听见的声音
avia.	亚声
multimed.	★ 次声
oil	次声频的
refrig.	亚音频
space	次声 (波); 亚声 (波，同 infrasonic sound)
infrasound Vibrations of the air at frequencies too low to be perceived as sound by the human ear, below about 15 hertz ['ɪnfrəsaʊnd] n
environ.	超低频音 (低于15赫兹，人耳无法识别的空气振动频率。)
English thesaurus
infrasound ['ɪnfrəsaʊnd] n
mil.	Very low-frequency sound which can travel long distances and easily penetrate most buildings and vehicles

infrasound : 6 phrases in 3 subjects

Air defense	1
Space	1
Technology	4