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而一个偏微分方程就是，函数各个偏导之间的联系，看看。
And a partial differential equation is some relation between its partial derivatives. Let me see.
youdao
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因此，有必要建立导曲线的方程序。
Thus, it is necessary to establish the equation of guiding curves.
youdao
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因此，有必要建立导曲线的方程序。
Thus, it is necessary to establish the equation of guiding curves.
youdao