| 单词 | ultrasonic |
| 释义 | ultrasonic (once / 80404 pages) adj WORD FAMILY ultrasonic: ultrasonically USAGE EXAMPLESThree of the sensory systems currently in use in autonomous vehicles—cameras, ultrasonic detectors and radar—are reasonably cheap and easy to deploy. Economist(Dec 20, 2016) Metro also recently purchased 16 ultrasonic leak detectors — they cost $800 apiece — that identify leaks in the compressed-air brake system. Washington Post(Dec 10, 2016) Its best-selling ultrasonic aroma diffuser spreads the scent of essential oils throughout a room and doubles as a soft light. Washington Post(Nov 29, 2016) adj having frequencies above those of audible sound Syn supersonic inaudible, unhearable impossible to hear; imperceptible by the ear |
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