permafrost
柯林斯词典
1. N-UNCOUNT Permafrost is land that is permanently frozen to a great depth. 永凍土層
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permafrost /ˈpɜːməˌfrɒst/
剑桥词典
- an area of land that is permanently frozen below the surface
永凍層，永凍土層 返回 permafrost
永凍層，永凍土層 返回 permafrost