名词
中文翻译：频率
同义词：
['rate', 'proportion', 'ratio例句：1. The frequency of occurrence is increasing.（发生的频率正在增加。）']
例句：
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1. The frequency of occurrence is increasing.
发生的频率正在增加。
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2.The frequency of light waves is directly proportional to the intensity of the source.
光波的频率与光源的强度成正比。
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3. The frequency of the signal changes with time.
信号的频率随时间变化。