per·ma·frost 
(pûrmə-frôst′, -frŏst′)
(pûrmə-frôst′, -frŏst′)n.
Permanently frozen subsoil, occurring throughout the Polar Regions and locally in perennially frigid areas.
[PERMA(NENT) + FROST.]
| 单词 | permafrost |
| 释义 | per·ma·frost (pûrmə-frôst′, -frŏst′)n. Permanently frozen subsoil, occurring throughout the Polar Regions and locally in perennially frigid areas. [PERMA(NENT) + FROST.] |
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