plane wave solution

例句：

1. 1. The wave equation is a fundamental equation in physics that describes the propagation of waves.
   波动方程是物理学中描述波传播的基础方程。
2. 2.In this problem, we are solving the plane wave equation to find the speed of light.
   在这个问题上，我们正在求解平面波方程以找出光速。
3. 3. The plane wave solution provides us with a simple model for understanding the behavior of waves in different media.
   平面波解为我们提供了一个简单模型，用于理解不同介质中波的行为。