non-linear eigenvalue problem

例句：

1. 1.The model is non-linear and requires special attention to solve the problem.
   这个模型是非线性的，需要特别注意来解决这个问题。
2. 2. In physics, a non-linear equation describes phenomena that cannot be easily described by linear equations.
   在物理学中，一个非线形方程描述的现象不能简单地用线性方程来描述。
3. 3. The relationship between the variables is non-linear, which means it doesn't follow a straight line path.
   变量之间的关系是非线形的，这意味着它不会沿着一条直线路径发展。