cylindrical polar coordinates

基本解释

So, somehow they are more polar than cylindrical coordinates.
某种意义上，它比柱坐标更实用和流行一点。
OK, so you know about cylindrical coordinates z where we have the z coordinates stay z, and the xy plane we do R and theta polar coordinates.
我们知道,柱坐标中z坐标还是，而x、y坐标，我们用R和θ来表示。
And cylindrical coordinates only mean that we are, instead of x, y and z, y we are replacing x and y by the polar coordinate in the x, y plane, r so the angle theta and the distance r.
柱坐标系就是，用平面上的极坐标替换x和，即角θ和距离。