Strictly-speaking, if you are curious, we could also change to weird coordinate systems Jacobian using Jacobian with three variables at the same time.
为了满足大家的好奇心，严格来说，我们也可以换成其他各种坐标系,只需在变量替换时，使用。
We are finding a parametric equation for the sphere using two variables phi and theta which happen to be part of the spherical coordinate system.
我们建立有两个变量φ和θ的球面的参数方程,它们恰好是,球坐标系统的一部分。
I should say this is an example, in case you were wondering what I was doing. We have also actually seen how to change variables to more complicated coordinate systems.
这只是一个，为了不让你们迷茫的例子，以前我们也学过，怎样在更复杂的坐标系中替换变量。
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