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1. Oxford Dictionary

   spherical coordinates

   • plural
     three coordinates that define the location of a point in three-dimensional space. They are the length of its radius vector r, the angle θ between the vertical plane containing this vector and the x -axis, and the angle φ between this vector and the horizontal x–y plane.
2. • 更多解釋

   spherical coordinates

   • IPA[ˈsfirəkəl]

   • plural
     three coordinates that define the location of a point in three-dimensional space. They are the ...

   Oxford American Dictionary