释义 |
DictionarySeeultrasoundultrasonic wave
ultrasonic wave[¦əl·trə′sän·ik ′wāv] (acoustics) A sound wave that has a frequency above about 20,000 hertz. ultrasonic wave
ultrasonic waveA sound wave of greater frequency than 20 kHz. These waves do not produce sound audible to the human ear. See also: waveFinancialSeeWave |