名词
中文翻译：永久冻土层
同义词：
['permanent glacial layer', 'perennial glacial layer']
例句：
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1. The team used a drone tosurvey the area and map out the permafrost layer.
团队使用无人机对该地区进行了勘察，并绘制了永久冻土层的地图。
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2. The research focused onunderstanding the impact of climate change on thepermafrost layer.
研究专注于理解气候变化对永久冻土层的影响。
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3. Thescientists discovered that the permafrostlayer was not as stable as they hadpreviously thought.
科学家们发现，永久冻土层并不像他们之前认为的那样稳定。