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1. Oxford Dictionary

   radius vector

   • n.
     a line of variable length drawn from a fixed origin to a curve.；a line of variable length joining a satellite or other celestial object to its primary.

   • noun: radius vector, plural noun: radius vectors

2. • 更多解釋

   radius vector

   • IPA[ˈrādēəs ˌvektər]

   美式

   • n.
     a line of variable length drawn from a fixed origin to a curve.

   Oxford American Dictionary