名词
中文翻译：频率
同义词：
['rate', 'quantity', 'degree', 'frequency of occurrence']
例句：
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1. The radio waves have a frequencyof 2.4 GHz.
无线电波的频率为2.4吉赫。
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2.The frequency of light is measured in nanometers.
光的频率以纳米为单位测量。
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3.The frequency of the signal varies with time.
信号的频率随时间变化。