| 单词 | ultrasonic |
| 释义 | ultrasonic (ʌltrəsɒnɪk ) adjective [usually ADJECTIVE noun] Ultrasonic sounds have very high frequencies, which human beings cannot hear. The research team recorded the ultrasonic squeaks that bats use for echolocation. Collocations: ultrasonic wave The pressure gradient in an ultrasonic wave moves particles relative to the fluid. Retrieved from Wikipedia CC BY-SA 3.0 Ultrasonic wave nebulizers are also used in humidifiers, to spray out water aerosols to moisten dry air in buildings. Retrieved from Wikipedia CC BY-SA 3.0 The most common type of electronic cigarettes currently sold, however, omit the ultrasonic wave nebulizer, as it was not found to be efficient enough for this kind of device. Retrieved from Wikipedia CC BY-SA 3.0 Tiny bubbles produced by the ultrasonic waves create microscopic vortexes that can remove even the most stubborn stains. Times, Sunday Times A vibrating crystal creates the ultrasonic waves that are radiated into the medium. Retrieved from Wikipedia CC BY-SA 3.0 |
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