Because of their preservation in permafrost, or permanently frozen ground, many woolly mammoth carcasses are in surprisingly intact conditions.

由于被保存在多年冻土，或者说永久冻土中，许多长毛猛犸象的尸体出人意料地保存完好。

And so the reason the land around us was collapsing is because the once permanently frozen ground called permafrost was starting to thaw.

我们周围的土地之所以崩塌是因为曾经的永久冻土，即长期冰冻的土地，正在不断融化。

Gosselin: And that's permafrost being permanently frozen ground, ground that doesn't go above zero degrees Celsius.

戈斯林：这就是永久冻土，即永久冻结的地面，温度不超过零摄氏度的地面。