degenerate art颓废艺术degeneratev.退化；堕落adj.堕落的；退化的n.堕落的人Degenerate parabolic systems退缩抛物方程组degenerate mutation operator退化变异算子degenerate lout-wave mixing简并四波混频degenerated elliptic equation退缩椭圆方程degenerate elliptic equations退化椭圆型方程degenerated elliptic operator退化椭圆算子degenerate parabolic equation退化抛物型方程degenerate four-wave mixing衰退四波混合degenerate Kirchhoff equation退化的Kirchhoff方程degenerate hyperbolic systems退化双曲型方程组