名词
中文翻译：Unknown
同义词：
['elbow speaker', 'elbow loudspeaker']
例句：
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1. The elbow amplifier is used to amplify the sound from the microphone.
肘部放大器用于放大麦克风的声音。
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2. The elbow amplifier is a popular choice for those who want to listen to music without disturbing others.
肘部放大器是那些想听音乐而不打扰他人的热门选择。
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3. The elbow amplifier is easy to use and can be easily adjusted to suit different listening environments.
肘部放大器易于使用，并且可以轻易调整以适应不同的听音环境。