名词
中文翻译：关键频率同义词
同义词：
['key frequency', 'critical frequency']
例句：
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1. The key frequency for this device is 20 MHz.
这个设备的临界频率是20兆赫。
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2. In the study of radio waves, key frequency refers to the frequency at which a signal can be transmitted with the greatestefficiency.
在无线电波研究中，关键频率指的是信号传输效率最高的频率。
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3. The scientist discovered that the key frequency for the absorption of light by matter was around 400 nm.
科学家发现，物质对光吸收的关键频率大约在400纳米处。