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BNC: 41317 COCA: 21966

permafrost

noun
/ˈpɜːməfrɒst/
/ˈpɜːrməfrɔːst/
[uncountable] (specialist)
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  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.
BNC: 41317 COCA: 21966
BNC: 41317 COCA: 21966
BNC: 41317 COCA: 21966
permafrost

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