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1. Oxford Dictionary

   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

2. • 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