Wind tunnel measurement gives the velocity field and vorticity field in intersection plane at different downstream position, which is up to 20 times cord-length.
风洞实验采用PIV测量了沿流向下游不同截面的涡量场和速度场，测量截面距机翼后缘最远达到20倍弦长。
So, remember, in the linear system, you can think of a linear system as asking you to find the intersection between three planes because each equation is the equation of a plane.
记住，线性方程组问题，可以理解为求三个平面的交，因为每个方程就是一个平面。
Say that I give you an ellipse in space as maybe the more, well, one exciting way to parameterize an ellipse in space is maybe the intersection of a cylinder with a slanted plane.
给定一个空间里的椭圆曲线，一个来参数化这曲线的有趣示例是,表示为圆柱体与斜面的相交部分。
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