permafrost
US /ˈpɝː.mə.frɑːst/
UK /ˈpɜː.mə.frɒst/
名词
永久冻土
a thick subsurface layer of soil that remains frozen throughout the year, occurring chiefly in polar regions and at high altitudes
示例:
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The melting of permafrost releases greenhouse gases into the atmosphere.
永久冻土的融化会向大气中释放温室气体。
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Construction in areas with permafrost requires special techniques.
在永久冻土地区施工需要特殊技术。