名词
中文翻译：频率变化
同义词：
['variation', 'fluctuation', 'change in frequency']
例句：
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1. The frequency of earthquakes has been increasing recently.
地震的频率最近一直在增加。
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2. The company's sales have seen a significant fluctuation due to the economic downturn.
由于经济衰退，该公司的销售额出现了显著波动。
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3.The new policy will significantly change the frequency of traffic congestion.
新政策将显著改变交通拥堵的频率。