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  1. permafrost

    • IPA[ˈpəːməfrɒst]

    英式

    • n.
      a thick subsurface layer of soil that remains below freezing point throughout the year, occurring chiefly in polar regions
    • noun: permafrost

    • 釋義
    • n.
      名詞
    • 1. a thick subsurface layer of soil that remains below freezing point throughout the year, occurring chiefly in polar regions:

      hilly terrain underlain by permafrost

  2. 知識+