人们通常直接在桌布上切面包，而不是在盘子上。
People often cut bread directly on a table cloth rather than on a plate.
对于给定的x，对应一个切面，就可以得到一个y的取值范围，从图片上看，是从切面的最左边到最右边。
For a given value of x, so that's a given slice, I have a range of values for y, that is, from this picture at the left most point on that slice to the rightmost point on that slice.
在这个案例中，我在我的主模型上切出一个切面，然后在Photoshop中操作，以此尝试一些想法。
In this case, I cut a section through my master model and worked it over in Photoshop to test out some ideas.
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