| 单词 | θ198207 |
| 释义 | society > communication > telecommunication > other types of sound telecommunication > [noun] (18) telephoning1877 radiophony1880 Originally: any of various techniques for producing or transmitting sound or electrical signals using beams of light; esp. = photophony n. at photo… photophony1881 the use of a photophone (sense 1). sonar1943 A method or system for detecting or locating underwater objects using sound, in which pulses of audible or higher-frequency sound are emitted, and… pinger1957 An underwater device that transmits pings at short intervals for purposes of detection, measurement, or identification; esp. a sonar transducer or… side scan1996 = side-scanner, n. Subcategories:— apparatus (12) |
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