time variable and nonlinear

• 时变非线性

time variable and nonlinear的用法和样例：

例句

1. Photoelectronic and photorefractive nonlinear optical crystals, Such as Photorefractive properties, nonlinear optics, Roman spectra and Luminescence spectra.
   光电及光折变非线性光学晶体材料性能研究。