多年冻土是埋藏于地表下多年不融化的含冰土层，是古代冰川气候的残留物。
Permafrost is underground soils containing ice which keep frozen for several years, it is remains of ancient glacial climate.
俄罗斯科学家将三万多年前松鼠埋藏在永久冻土层中的果实培育成活。
Scientists in Russia have grown plants from fruit stored away in permafrost by squirrels over 30,000 years ago.
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