Now, there's also spherical coordinates.
现在，考虑球坐标。
There we want to think a tiny bit about spherical coordinates again.
我们需要再次考虑球坐标。
OK, let's see, who had seen spherical coordinates before just to see?
我看看，谁曾经学过球坐标么？
OK, let's see, who had seen spherical coordinates before just to see?
我看看，谁曾经学过球坐标么？
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