Second-order nonlinear optic

• 二阶非线性

Second-order nonlinear optic的用法和样例：

例句

1. This paper is devoted to study the oscillation of second order nonlinear differential equations with impulses.
   摘要对二阶非线性脉冲微分方程的振动性给出了充分判据。
2. made it
   （病痛等）好转；达到预定目标；及时抵达；走完路程