propagation coefficient

例句：

1. 1.The propagation coefficient of the virus is a critical factor in its spread.
   病毒的传播系数是其传播的关键因素。
2. 2. In this study, we calculated the propagation coefficient for different scenarios.
   在这项研究中，我们计算了不同情况下的传播系数。
3. 3. The propagation coefficient of the disease was found to be higher in urban areas than in rural areas.
   研究发现，这种疾病的传播系数在城市地区高于农村地区。