finite difference calculus

例句：

1. 1.Finite difference methods are used to solve partial differential equations.
   有限差分方法用于解决偏微分方程。
2. 2. Finite difference methods have been widely applied in engineering and science.
   有限差分方法在工程和科学领域得到了广泛应用。
3. 3. Finite difference methods can be used to simulate the behavior of complex systems.
   有限差分方法可以用来模拟复杂系统的运行行为。