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1. Oxford Dictionary

   polar vortex

   • n.
     a very large, long-lived, rotating low-pressure system located near the north or south pole, especially in winter

   • noun: polar vortex, plural noun: polar vortices

2. • 釋義

   n.

   名詞

   • 1. a very large, long-lived, rotating low-pressure system located near the north or south pole, especially in winter earlier in the year, a weather phenomenon known as a polar vortex chilled North America to record low temperatures