名词
中文翻译：Unknown
同义词：
['variable capacitor', 'variable condenser', 'varactor']
例句：
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1. The circuit requires a variable capacitor to adjust the voltage.
电路需要可变电容器来调整电压。
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2. The varactor is used in electronic devices to control the frequency.
可变电容器用于电子设备中控制频率。
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3. The varactor's performance depends on the temperature and humidity of the environment.
可变电容器的性能取决于环境的温度和湿度。