Well, we've seen a formula, for example, for a horizontal plane, or for something that's parallel to the yz plane or the xz plane.

我们已经学过一个公式，它是关于水平面的，或者某些平行于yz平面或xz平面的平面。

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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.

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。

youdao

So, what I'm going to do is I'm going to take planes, say in this picture, parallel to the yz plane.

我们要做的就是…，在这张图片里，用平行于yz平面的。

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