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。
If I look only at the slice parallel to the X-axis then maybe I am going through the minimum.
在微积分中，在函数的极小值点上导数等于零或者不存在导数。
In calculus, the derivative equals zero or does not exist at a function's minimum point.
但这种办法并不普遍，只能用于二元函数，来判断是极小值点、极大值点还是鞍点。
I should say that is for a function of two variables to try to decide whether a given critical point is a minimum, a maximum or a saddle point.
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