名词
中文翻译：扩音器
同义词：
['amplifyer', 'amplifier']
例句：
-
1. The engineer used an amplifier to boost the volume of the recording.
工程师使用一个放大器来提高录音的音量。
-
2. The teacher demonstrated how to use an amplifier to improve sound quality.
老师演示了如何使用放大器来提高音质。
-
3. The loudspeakers in the concert hall were all amplifiers.
音乐会厅里的扬声器都是放大器。