形网格绘制等值线。
So, now, I'm picking a point on the contour plot.
现在，在等高线图上取一点。
So, the contour plot, well, let me actually zoom out.
我们来放大它的等高线图。
OK, so that's an example of a contour plot of a function.
这就是一个关于函数等高线图的例子。
The second problem is one about writing a contour plot.
第二题是找等高线。
That is the contour plot of f with a hyperbola on top of it.
上面这个是f的等高线，黄色的就是双曲线。
That is the contour plot of f with a hyperbola on top of it.
上面这个是f的等高线，黄色的就是双曲线。
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