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| Chinese | English |
| 超低频音 | infrasound Vibrations of the air at frequencies too low to be perceived as sound by the human ear, below about 15 hertz (低于15赫兹，人耳无法识别的空气振动频率。) |
|
| Chinese | English |
| 超低频音 | infrasound Vibrations of the air at frequencies too low to be perceived as sound by the human ear, below about 15 hertz (低于15赫兹，人耳无法识别的空气振动频率。) |