单词	infrasonic
释义	infrasonic /ˌɪnfrəˈsɒnɪk / adjective Relating to or denoting sound waves with a frequency below the lower limit of human audibility.Using calls that have infrasonic fundamental frequencies, female elephants are able to communicate with large numbers of specific individuals over long distances.... Preliminary findings with electrostatic fields, ionizing radiation, infrasonic waves, and meteorological factors are also examined to consider their effects on the brain in relation to apparitional experiences. When the rate of vibration is below the range of human hearing, the sound is termed infrasonic; when it is above that range, it is called ultrasonic.
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