偏微分方程就是，跟函数各个偏导数有关的方程。
A partial differential equation is an equation that involves the partial derivatives of a function.
微分方程简单说是含有导数的方程。
A differential equation is simply an equation that contains a derivate.
微分方程简单说是含有导数的方程。
A differential equation is simply an equation that contains a derivate.
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