pseudo-differential equation

例句：

1. 1. The pseudo-differential equation is a type of partial differential equation that cannot be solved analytically.
   伪差分方程是一种无法解析求解的偏微分方程类型。
2. 2. In the field of fluid dynamics, the pseudo-differential equation is used to model complex flow patterns.
   在流体动力学领域，伪差分方程被用来模拟复杂的流动模式。
3. 3. The pseudo-differential equation was proposed by mathematician André Weyl in1905 as an alternative to the partial differential equation.
   伪差分方程是由数学家安德烈·魏尔于1905年提出的一种与偏微分方程相对立的数学概念。