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单词 permafrost
释义

per·ma·frost

noun
/ˈpɜːməfrɒst/
/ˈpɜːrməfrɔːst/
[uncountable] (specialist)
  1. a layer of soil that is permanently frozen, in very cold regions of the world(寒带)永久冻土,永冻土,多年冻土
    Word Origin1940s: from permanent + frost.
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更新时间:2026/3/2 11:40:42