The easiest of all, probably, is to just go first along the x-axis to and then go up parallel to the y-axis.
最简单的会是，首先沿x轴到,然后平行于y轴走。
Draw a line at 80% on Y-axis parallel to X-axis.
在与X轴平行的Y轴的80%处画一条直线。
If I look only at the slice parallel to the X-axis then maybe I am going through the minimum.
如果我只观察平行于x轴的切面，那这应该是一个极小值点。
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