Ice will vanish from Arctic summers and some mountaintops, permafrost will become impermanent, sea levels will keep rising.
在夏季，冰会从北极和一些山顶消失，永冻层将会变得“无常”，海平面将继续上涨。
In permafrost regions, the construction of railway should keep the subgrade frozen permanently so as to maintain the stability of the frozen subgrade.
在多年冻土地区修建铁路，为确保冻土路基的稳定，应使路基长期处于冻结状态。
Permafrost is underground soils containing ice which keep frozen for several years, it is remains of ancient glacial climate.
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。
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