名词
中文翻译：Unknown
同义词：
['polar tundra', 'permafrost', 'cold desert']
例句：
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1. The polar tundra is home to many unique species of animals.
极地苔原是许多独特物种的家园。
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2. The permafrost has been frozen for thousands of years.
永久冻土层已经冻结了数千年。
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3. The cold desert climate makes it difficult for plants to grow.
寒冷的沙漠气候使得植物难以生长。