spherical coordinates

基本解释

And, you switch it into spherical coordinates.
將這個方程轉換到球坐標形式。
There we want to think a tiny bit about spherical coordinates again.
我們需要再次考慮球坐標。
But since spherical coordinates we have actually learned about something much more interesting,namely spherical coordinates.
但我們已經學習了更有意思的東西,即球坐標。

three coordinates that define the location of a point in three-dimensional space in terms of the length r of its radius vector, the angle, , which this vector makes with one axis, and the angle, , made by a second axis, perpendicular to the first, with the plane containing the first axis and the point. Usually written (r, , )