release-kill ratio

例句：

1. 1. The release rate of the vaccine is crucial for its effectiveness.
   疫苗的释放率对其有效性至关重要。
2. 2. The efficiency rate of the new machine has been greatly improved.
   新机器的效率率已经大大提高了。
3. 3. The release rate of the pollutants is a major concern for environmental protection.
   污染物的释放率是环境保护的一个主要问题。