格式塔学派的心理学家认为，物体是在一个平行的过程中被识别为整体的：在一个单一的操作中，内部表征与视网膜图像匹配。
Psychologists of the Gestalt school maintain that objects are recognized as wholes in a parallel procedure: the internal representation is matched with the retinal image in a single operation.
对于给定的x，我们要做的就是，用平行于yz平面的平面去切图像。
OK, and for a given value of x, what we will do is we'll slice our graph by this plane parallel to the yz plane.
从图像上看，它们对应于,用平行于坐标轴的平面横截图像得到的，过程中保持x或y恒定。
And, in terms of a graph, they correspond to slicing by a plane that's parallel to one of the coordinate planes, so that we either keep x constant, or keep y constant.
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