That means I want maybe to look at the projection of this guy onto a horizontal plane.
那就意味着,我可能想看到,这个在水平面上的投影。
Say you have a minimum, well, the tangent plane at this point, at the bottom of the graph is going to be horizontal.
如果你说这是个极小值,那么这点的切平面应该是水平的。
Allow text to wrap at the page border to prevent the need for horizontal scrolling.
允许文本在页面边界处自动换行,避免出现需要水平滚动的情况。
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