polar coordinate plane

基本解釋

So the idea of spherical coordinate is you're going to polar coordinates again in the rz plane.
所以說球坐標系,其實就是在rz平面再建立一個極坐標。
In this paper, the general solution for plane problem of elastic mechanics in polar coordinate system is deduced by separate variable method.
用分離變量法推導出極坐標彈性力學平面問題的一般解，給出了問題的解答全貌，為解決各種具體問題提供了理論基礎。
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.
柱坐標系就是，用平面上的極坐標替換x和，即角θ和距離。