nonlinear master equation

例句：

1. 1. The system is nonlinear and can be difficult to model.
   这个系统是非线性的，很难建模。
2. 2.Nonlinear equations are used to describe the behavior of systems that cannot be described by linear equations.
   非线性方程用来描述不能用线性方程描述的系统的行为。
3. 3. In physics, a nonlinear element is an element that exhibits a non-linear relationship between its state variables.
   在物理学中，非线性元素是指其状态变量之间存在非线性关系的元件。