... differential equation 微分方程 concept of difference equation 差分方程的概念 first order differential equation 一阶微分方程 ...
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由此提出了扩展边界节点的概念，并使用有限差分法，对所得到的差分方程组进行了计算机求解及模拟。
The concept of extended boundary node was presented. By using finite difference method, the solution of the gained difference equations was given and simulated by computer.
建立了系统的水文地质概念模型和地下水流模拟模型，采用基于有限差分方法的MODOFLOW软件对所建立的三维地下水流方程进行了求解。
On the basis of a conceptual model in the area, a 3-dimensional groundwater flow model is developed and calibrated by MODOFLOW, which is based on finite difference system.
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