这是根据伽利略变换的概念，并参考框架。
This is the basis of the Galilean transformation, and the concept of frame of reference.
应用伽利略变换对简化后的方程进行变量变换，使得曲面函数仅与空间相关；
The Galilean transformation was applied to the simplified equation to make a surface function related to only coordinates.
应用伽利略变换对简化后的方程进行变量变换，使得曲面函数仅与空间相关；
The Galilean transformation was applied to the simplified equation to make a surface function related to only coordinates.
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