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1. Oxford Dictionary

   radial velocity

   • n.
     the velocity of a star or other body along the line of sight of an observer.

   • noun: radial velocity, plural noun: radial velocities

2. • 更多解釋

   radial velocity

   • IPA[ˌrādēəl vəˈläsədē]

   • n.
     the velocity of a star or other body along the line of sight of an observer.

   Oxford American Dictionary