单词	infrasound
释义	infrasound /ˈɪnfrəsaʊnd / noun [mass noun] Sound waves with frequencies below the lower limit of human audibility: [as modifier]: infrasound generators... Laser weapons, isotropic radiators, infrasound, non-nuclear electromagnetic pulse generators, and high-power microwave emitters have been mentioned. The answer, Zuckerwar explains, is that each one generates silent infrasound - long sound waves at a frequency below 20 hertz. When snow rushes down mountains, it pushes air before it and creates infrasound at frequencies below 8 Hz.
随便看	plastidule plastifier plastify plastigel plastimeter plastin plastination plastique plastiquer plastiqueur plastisol plastochron plastochrone plastochronic plastochron index plastochron ratio plastocyanin plastogamy plastom plastome plastometer plastoquinone plastral plastron -plasty

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