名词
中文翻译：频率
同义词：
['rate', 'recurrence']
例句：
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1. The frequencyof earthquakes in this area is relativelyhigh.
这个地区的地震频率相对较高。
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2. Thefrequency 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 trafficaccidents has decreased significantly over the past decade.
过去十年间，交通事故的发生频率显著下降。