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绘制带有密度背景的流线

绘制向量场的范数的密度，并将其作为背景.

    
Wolfram Language code: StreamDensityPlot[{Cos[x ^ 2 + y], 1 + x - y ^ 2}, {x, -3, 3}, {y, -3, 3}, ColorFunction -> "RedBlueTones", StreamColorFunction -> None, StreamStyle -> Black, StreamPoints -> Medium, ImageSize -> Medium]