rate-of-spread meter

例句：

1. 1.The rate of spread of the virus is critical to understanding its impact on the population.
   病毒的传播速率对理解其对人群的影响至关重要。
2. 2.The rate of spread of information is a key factor in determining how quickly it can be disseminated.
   信息传播速率是决定信息传播速度的关键因素。
3. 3.The rate of spread of the disease has been monitored closely by health officials.
   卫生官员密切监控疾病的传播速率。