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