单词spherical coordinates
un.: 球面坐标
网络: 球坐标；球面座标；球坐标系
球面坐标
Now, it is OK to think of them as spherical coordinates, but I would like to encourage you not to think of them as spherical coordinates.
那么现在可以在球坐标上考虑了，但是我希望大家，不要把它们看做球坐标。
And now, we"re going to try to find the volume of that spherical cap again but using spherical coordinates instead.
现在来求下被切出的球冠的体积，我们用球坐标来求。
Spherical coordinates are a way of describing points in space in terms of three variables.
球坐标是一种用三个变量，表示空间中点的位置的方法。
OK, so note how the equation of this horizontal plane in spherical coordinates has become a little bit weird.
球坐标下的平面方程，看上去有点诡异。
But since spherical coordinates we have actually learned about something much more interesting, namely spherical coordinates.
但我们已经学习了更有意思的东西，即球坐标。
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？
So, if you are asked to find the average distance from the origin, spherical coordinates can be interesting.
如果你想求到中心的平均距离，球坐标还是不错的。
But let"s do it in spherical coordinates because that"s the topic of today.
但我们用球坐标来做，因为这才是今天的主题。
There we want to think a tiny bit about spherical coordinates again.
我们需要再次考虑球坐标。
We have rectangular coordinates, we have cylindrical coordinates and we have spherical coordinates.
我们有直角坐标系，有柱坐标系和球坐标系。