non-linear Schrodinger equation

例句：

1. 1.The relationship between the two variables is non-linear.
   这两个变量之间的关系是非直线的。
2. 2.The system is non-linear, meaning that small changes in one variable can have a big effect on the others.
   这个系统是非线性的，意味着一个变量的小变化会对其他变量产生大影响。
3. 3.Non-linear models are often used to describe complex systems where the behavior of one variable depends on the values of other variables.
   非线性模型常用于描述复杂系统，其中一个变量的行为取决于其他变量的值。