名词短语
中文翻译：演讲麦克风
同义词：
['lecture microphone', 'speakerphone', 'audiometer例句：1. The teacher used a speaker-microphone to explain the concept of gravity.（老师使用了一个演讲麦克风来解释重力的概念。）']
例句：
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1. The teacher used a speaker-microphone to explain the concept of gravity.
老师使用了一个演讲麦克风来解释重力的概念。
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2.During the presentation, the speaker-microphone was used to capture sound from the audience.
在演示过程中，演讲麦克风被用来捕捉来自观众的声音。
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3. The student asked for a speaker-microphone so he could practice his speech in front of the class.
学生请求一个演讲麦克风以便在全班面前练习他的演讲。