rate theory

例句：

1. 1. The rate of change in thepopulation is a key factor in economic growth.
   人口增长率是经济增长的关键因素。
2. 2. The ratetheory suggests that the speed of information transmissionis proportional to the distance between two points.
   速率理论表明，信息传播的速度与两点之间的距离成正比。
3. 3. The rate theory has beenwidely applied in various fields, includingphysics and engineering.
   速率理论已被广泛应用于物理学和工程学等领域。