natural mortality coefficient

例句：

1. 1.The study of natural mortality is crucial for understanding the dynamics of population growth.
   研究自然死亡率对于理解人口增长的动态至关重要。
2. 2. The mortality rate in this region is significantly higher than that in other parts of the country.
   该地区的死亡率远高于全国其他地区。
3. 3. The coefficient of natural mortality was used to estimate the number of deaths caused by disease.
   使用自然死亡率系数估算了由疾病导致的死亡人数。