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1. The study found that the observational frequency of this disease in the population is increasing.
研究发现，这种疾病在人群中的观察频率正在上升。
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2. This model provides a good basis for predicting the observational frequency of diseases.
这个模型为预测疾病观察频率提供了一个良好的基础。
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3. The researcher analyzed the data to determine the observational frequency of the virus in different regions.
研究者分析了数据，以确定不同地区病毒的观察频率。