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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

    • 釋義

    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