nonlinear electrooptical crystal

例句：

1. 1. The system is nonlinear, meaningthat it has a non-linear relationshipbetween inputs and outputs.
   这个系统是非线性的，意味着输入和输出之间存在非线性关系。
2. 2. Nonlinear models areoften used in physics to describephenomena that cannot be explained by linear equations.
   非线性模型常用于物理学中，用来描述不能用线性方程解释的现象。
3. 3. In nonlinearsystems, small changes in one variable canhave a significant impact on the other variables.
   在非线性系统中，一个变量的小变化会对其他变量产生重大影响。