名词
中文翻译：频率
同义词：
['rate', 'quantity', 'recurrence']
例句：
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1.The frequency of occurrence is very low.
发生的频率非常低。
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2. The frequency of the signal changes with time.
信号的频率随时间变化。
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3. The frequency of light waves is measured in cycles per second.
光波的频率以每秒周期数来衡量。