exponential part format

例句：

1. 1.The exponential function is used to model the growth of a population over time.
   指数函数用于模拟人口随时间的增长。
2. 2.In exponential growth, the rate of increase accelerates with each period.
   在指数增长中，每个周期的增加速率都会加速。
3. 3. The company's revenue has been growing exponentially since its inception.
   自公司成立以来，其收入一直在以指数速度增长。