first difference approach
... value-added approach : 增加值法 first difference approach : 一阶差分法 quantitative approach : 计量方法 ...
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first difference approach
一阶差分法
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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First, the partial differential equations are transformed into discrete space, discrete time nonlinear difference equations through characteristic method and finite difference approach.
首先，通过特征线法和有限差分法得到了时间离散和空间离散的非线性状态方程。
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