名词
中文翻译：永久冻土
同义词：
['perennial ice', 'perpetual ice']
例句：
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1.The region is famous for its permafrost, which can be up to 30 meters deep.
该地区以永久冻土而闻名，深度可达30米。
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2. The research team found that the permafrost was melting at a rate of about 10 centimeters per year.
研究小组发现永久冻土每年融化约10厘米。
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3. The permafrost is a key factor influencing the climate and geology of the region.
永久冻土是影响该地区气候和地质的关键因素。