opaque substrate meaning in English

不透明底基

The finite element model of the thermal conductive equation and the thermo - elastic equation in the system consisting of a transparent coating and a opaque substrate is established based on the analysis of the stability of solution and two important parameters , meshing size and time step
摘要在分析了网格大小和时间步长这两个重要参数和求解稳定性的基础上，采用有限元方法建立了透明薄膜基底系统的热传导方程和热弹性方程的有限元模型。