whirl·wind /-ˌwɪnd/
 旋風,旋渦,旋流


 Whirl·wind n.
 1. A violent windstorm of limited extent, as the tornado, characterized by an inward spiral motion of the air with an upward current in the center; a vortex of air. It usually has a rapid progressive motion.
 The swift dark whirlwind that uproots the woods.
 And drowns the villages.   --Bryant.
 Note: ☞ Some meteorologists apply the word whirlwind to the larger rotary storm also, such as cyclones.
 2. Fig.: A body of objects sweeping violently onward.  “The whirlwind of hounds and hunters.”

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 whirlwind
      n : a more or less vertical column of air whirling around itself
          as it moves over the surface of the Earth