Because the determining systems are a linear or nonlinear overdetermined PDEs, it is very hard to solve them completely.
由于决定方程组是超定的、线性的或非线性的偏微分方程组，完全求解它们非常困难。
Because the determining systems are a linear or nonlinear overdetermined PDEs, it is very hard to solve them completely.
由于决定方程组是超定的、线性的或非线性的偏微分方程组，完全求解它们非常困难。
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