Permafrost Roadbed多年冻土;冻土路基
active permafrost活跃永冻层;活动性永久冰层;[地质] 活动永冻土;活动永冻土
relict permafrost残余永冻土;[地质] 残遗永久冻土;残遗永久冻土
permafrost aggradation多年冻土进化;冻土进化
Permafrost Trap永冻陷阱
permafrost regions多年冻土区;多年冻土地区
permafrost island孤立永冻区;永冻土孤岛
plateau permafrost高原冻土;高原多年冻土
planetary permafrost行星多年冻土
Patchy permafrost is ede of vast and continuous permafrost zone which is degrading, it is discontinuous horizontally.
岛状多年冻土是大片连续多年冻土退化的边缘地带，具有平面上不连续特点。
参考来源 - 岛状多年冻土地区路基路面稳定性研究Finally, the reasonable design parameters were provided to the project, and the investigation was significant to the design of the thermosyphon foundation in the permafrost region in China.
最终,为该工程取得了合理的设计参数。 以上工作将对多年冻土地区热桩基础的设计有重要的参考价值。
参考来源 - 高寒地区高压输电杆塔热桩基础研究N-UNCOUNT（不可数名词） Permafrost is land that is permanently frozen to a great depth. 永冻土层