Megaphone

(noun.) a cone-shaped acoustic device held to the mouth to intensify and direct the human voice.

克利夫顿录入

• The use of a megaphone or speaking trumpet for conveying the sound of the voice to a distance is based on the same principle. 佚名. 神奇的知识之书.
• When a National Committee puts a megaphone to a man's mouth and tells him to yell, it is difficult for him to hear anything. 沃尔特·李普曼. 政治序论.
• These converging horns or funnels, with a large speaking-trumpet in between them, are mounted on a tripod, and the megaphone is complete. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.
• Conversation can be carried on with this megaphone at a distance of over two miles, as with a ship or the balloon. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.
• The megaphone has been found very useful in speaking to large outdoor crowds. 威廉·亨利·杜利特. 世纪发明.
• The _Megaphone_ of Edison appeared, consisting of two large funnels having elastic conducting tubes from their apices to the aural orifice. 威廉·亨利·杜利特. 世纪发明.

安德里亚录入