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绘制密度和网格并叠加流线

    
Wolfram Language code: f = Sin[x + y ^ 2]; gradient = Grad[f, {x, y}];
Wolfram Language code: StreamDensityPlot[{gradient, f}, {x, -2, 2}, {y, -2, 2}, Mesh -> 5, ColorFunction -> "BeachColors", MaxRecursion -> 1]