| 单词 | acoustic device |
| 释义 | acoustic device (once / 2363863 pages) n WORD FAMILY acoustic device USAGE EXAMPLESDivision of Police officials on Monday held a demonstration for its newest tool - a long-range acoustic device mounted atop an armored vehicle. Washington Times(Nov 22, 2016) They were followed by police officers, including one carrying an acoustic device that issued recorded warnings that blocking vehicles could lead to arrest. New York Times(Mar 19, 2016) An ominous message—“This is a test of the Long-Range Acoustic Device LRAD”—was followed by an ever louder count to ten. The New Yorker(Jun 09, 2015) n a device for amplifying or transmitting sound Exp|Hypo|Hyper Liberty Bell the bell of Independence Hall; rung 8 July 1776 to announce the signing of the Declaration of Independence bell a hollow device made of metal that makes a ringing sound when struck birdcalla device for imitating a birdcall ear trumpet, hearing aida conical acoustic device formerly used to direct sound to the ear of a hearing-impaired person megaphonea cone-shaped acoustic device held to the mouth to intensify and direct the human voice mouthpiecean acoustic device; the part of a telephone into which a person speaks mutea device used to soften the tone of a musical instrument muffler, silencera tubular acoustic device inserted in the exhaust system that is designed to reduce noise sirenan acoustic device producing a loud often wailing sound as a signal or warning slapstickacoustic device consisting of two paddles hinged together; used by an actor to make a loud noise without inflicting injury when striking someone speaking trumpeta trumpet-shaped acoustic device to intensify and direct the human voice; formerly held to the ear by a hard-of-hearing person whistleacoustic device that forces air or steam against an edge or into a cavity and so produces a loud shrill sound boat whistlea whistle on a boat that is sounded as a warning church bella bell in a church tower (usually sounded to summon people to church) cowbella bell hung around the neck of cow so that the cow can be easily located death bell, death knella bell rung to announce a death dinner bella bell rung to announce that dinner has been served electric bella bell activated by the magnetic effect of an electric current factory whistlea whistle at a factory that is sounded to announce times for starting or stopping work fire bella bell rung to give a fire alarm school bella bell rung to announce beginning or ending of class sheep bella bell hung round the neck of a sheep so that the sheep can be easily located shop bella bell attached to the door of a small shop; warns the proprietor that a customer has entered the shop cascabel, sleigh bella bell attached to a sleigh, or to the harness of a horse that is pulling a sleigh sordino, sourdinea mute for a violin steam whistlea whistle in which the sound is produced by steam; usually attached to a steam boiler tocsin, warning bella bell used to sound an alarm device an instrumentality invented for a particular purpose |
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