nonlinear elementary excitation

例句：

1. 1.The nonlinear element in the system is causing significant issues.
   系统中的非线性元素导致了严重的问题。
2. 2. The nonlinear behavior of the material under high pressure was studied in detail.
   详细研究了材料在高压下的非线性行为。
3. 3. Nonlinear systems are difficult to model and analyze, but they can be very useful in certain applications.
   非线性系统难以建模和分析，但在某些应用中非常有用。