名词
中文翻译：调音器
同义词：
['tuner', 'tuning device']
例句：
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1. The engineer used a tuning meter to adjust the frequency of the radio.
工程师使用调音器来调整收音机的频率。
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2. The technician needs to tune the meter before starting the machine.
技术人员需要先调校仪表才能启动机器。
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3. The musician tuned his guitar for the concert performance.
音乐家为音乐会表演调校了他的吉他。