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Vortex ring

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Vortex ring \Vortex ring\ (Physics)
   A ring-shaped mass of moving fluid which, by virtue of its
   motion of rotation around an axis disposed in circular form,
   attains a more or less distinct separation from the
   surrounding medium and has many of the properties of a solid.
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