permafrost
n.永久冻结带
难易程度:
permafrost为短语/超纲词汇
permafrost
/'pɜ:məfrɒst; [US] -frɔ:st; `pɝmə,frɔst/
n [U] subsoil that is permanently frozen, eg in polar regions 永冻土, 永冻层（如在极地的）.
n [U] subsoil that is permanently frozen, eg in polar regions 永冻土, 永冻层（如在极地的）.
permafrost
n[U]
[Date: 1900-2000; Origin: permanent + frost]
a layer of soil that is always frozen in countries where it is very cold
[Date: 1900-2000; Origin: permanent + frost]
a layer of soil that is always frozen in countries where it is very cold
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