n.(寒带)永冻土层，永冻层

The melting of permafrost in the Arctic is releasing large amounts of methane, a potent greenhouse gas.
北极地区永久冻土的融化正在释放大量的甲烷，这是一种强效的温室气体。
Scientists are studying the effects of climate change on the stability of permafrost in Siberia.
科学家正在研究气候变化对西伯利亚永久冻土稳定性的影响。
Permafrost covers nearly a quarter of the Northern Hemisphere's land area.
永久冻土覆盖了北半球近四分之一的陆地面积。
The thawing of permafrost can cause significant changes in the landscape, including landslides and sinkholes.
永久冻土的融化会导致地貌发生显著变化，包括滑坡和塌陷。
Traditional houses in some Arctic communities are built on stilts to prevent damage from shifting permafrost.
北极地区一些社区的传统房屋建在桩子上，以防止因永久冻土移动而受损。
As permafrost melts, it reveals ancient artifacts and preserved remains of Ice Age animals.
随着永久冻土的融化，它揭示了古代文物和冰河时代动物的保存遗骸。
The occurrence of permafrost is not limited to polar regions; high altitude areas like the Tibetan Plateau also have extensive permafrost.
永久冻土的存在并不仅限于极地地区；像青藏高原这样的高海拔地区也有广泛的永久冻土。
Permafrost acts as a natural preservative, keeping organic materials intact for thousands of years.
永久冻土充当了一种天然防腐剂，使有机物质几千年保持完整。
Researchers are concerned about the feedback loop where warming temperatures cause permafrost to thaw, which releases more greenhouse gases, further accelerating global warming.
研究人员担心这样一个恶性循环：温度升高导致永久冻土融化，释放更多温室气体，进一步加速全球变暖。
Infrastructure projects in permafrost regions face unique challenges, requiring specialized engineering techniques to maintain stability in constantly changing ground conditions.
在永久冻土区域的基础设施项目面临独特挑战，需要采用特殊工程技巧以维持在不断变化的地面条件下的稳定性。