名词
中文翻译：频率
同义词：
['rate', 'recurrence']
例句：
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1.The frequency of earthquakes in this area is relatively high.
这个地区的地震频率相对较高。
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2.The frequency of occurrence of the disease is low.
这种疾病的发生率很低。
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3. The frequency of light waves is directly related to their wavelength.
光波的频率与它们的波长直接相关。