formation frequency的用法和樣例：
例句
- Frequency of compound heterozygosity was similar in both groups.
兩組的對偶基因為異型合子的發生頻率則相似。 - This study also gave the directions to decrease the frequency of occurring gloomy weather and came up with some tactics to forecast and forewarn such weather.
並對如何降低灰霾天氣的發生頻率，以及如何做好灰霾天氣預測預警工作作了相關探討。
