frequency audiometer

例句：

1. 1.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。
2. 2. The frequency of occurrence of a disease in a population can be used to predict future outbreaks.
   疾病在人群中的发生频率可以用来预测未来的爆发。
3. 3.The frequency of this event has been increasing over the past decade.
   这一事件的频率在过去十年里一直在增加。