名词
中文翻译：恒定频率
同义词：
['constant rate', 'constant ratio例句：1. The frequency of occurrence is constant.（发生的频率是恒定的。）']
例句：
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1. The frequency of occurrence is constant.
发生的频率是恒定的。
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2. The constant frequency of the waves makes it difficult to detect.
波的频率恒定，使得探测变得困难。
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3.The constant frequency of the waves is a result of their periodic nature.
波的频率恒定是其周期性的结果。