名词
中文翻译：频率
同义词：
['rate', 'recurrence', 'occurrence']
例句：
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1.The frequency of earthquakes in this area is increasing.
这个地区的地震频率在增加。
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2.The frequency of people using social media has been declining.
使用社交媒体的人数频率正在下降。
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3. 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。