它显示了其在永久冰冻区之上的表面由于多次冰冻和融化已经成为多边形的冰板。
They show a surface broken into polygonal slabs by repeated freezing and thawing of the sort that happens above permafrost.
由于许多长毛象死后很快就被冰冻的沉积物所包裹，许多长毛象的尸体在西伯利亚严寒的永久冻土层中得以完好保存。
Because many mammoths became quickly wrapped in frozen sediment after they died, many of their remains have survived in the Siberian deep freeze.
雅库茨克是世界上建设在永久冻土上最大的城市——土壤在全年都保持冰冻。
Yakutsk is the largest city in the world built on permafrost - soil that remains permanently frozen year round.
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