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permafrost

Related topics: Geology
per·ma·frost /ˈpɜːməfrɒst $ ˈpɜːrməfrɒːst/ noun [uncountableU]  
HEGa layer of soil that is always frozen in countries where it is very cold 永久冻土层
Examples from the Corpus
Origin permafrost
(1900-2000) permanent + frost
per·ma·frost noun
Chinese
Syllable
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