名词
中文翻译：苔原
同义词：
['polar tundra', 'permafrost']
例句：
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1.The polar tundra is home to many unique species of plants and animals.
极地苔原是许多独特植物和动物的家园。
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2.The permafrost is a layer of frozen soil that can remain undisturbed for thousands of years.
永久冻土层是一层冰冻土壤，可以保持数千年不变。
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3. The tundra is an important habitat for Arctic foxes and other wildlife.
苔原是北极狐和其他野生动物的重要栖息地。