| 释义 |
per·ma·frost AHD[pûrʹmə-frôst', -frŏst'] D.J.[ˈpɜːməˌfrɔːst, -ˌfrɒst]K.K.[ˈpɝməˌfrɔst, -ˌfrɑst]n.（名词）- Permanently frozen subsoil, occurring throughout the Polar Regions and locally in perennially frigid areas.永冻土：永久冰冻的下层土壤，出现在整个北极地区和部分长期寒冷的地区
- perma(nent) perma(nent)
- frost frost
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