characteristic difference 基本例句 特征差分 As for the improved method presented in Chapter 3, the newcharacteristic differencemethod based on linear interpolation is simple and non-oscillatory.至于第三章所提出的基于线性插值的改进特征差分格式，由于其构造简单，而且能有效消除数值震荡现象，适用于求解对流占优的对流扩散方程。