求翻译：冻土是指零摄氏度以下，并含有冰的各种岩石和土壤。一般可分为短时冻土和季节冻土以及多年冻土（数年至数万年以上）。冻土是一种对温度极为敏感的土体介质，含有丰富的地下冰。因此，冻土具有流变性，其长期强度远低于瞬时强度特征。正由于这些特征，在冻土区修筑工程构筑物就必须面临两大危险：冻胀和融沉。随着气候变暖，冻土不断退化。我国的冻土主要分布在西北等北方地区，特别是西藏地区多年冻土极多在这些地方冻土对建筑物的影响是不可忽略的！。是什么意思？

Permafrost is below zero degrees Celsius, and contains a variety of rocks and soil ice. Generally can be divided into short-term permafrost and seasonally frozen soil and permafrost (years to tens of thousands of years). Permafrost is extremely sensitive to the temperature of the soil medium, rich i

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The frozen earth is refers to below the zero degree Celsius, and includes ice each kind of rock and the soil.May divide into the short-time frozen earth and the season frozen earth as well as many year frozen earth generally (several years to tens of thousands of years above).The frozen earth is one

Permafrost is below zero degrees Celsius, and the various rocks and soils containing ice. Generally can be divided into short-permafrost and seasonally frozen ground and permafrost (more than a few to tens of thousands of years). Permafrost soil media is a very sensitive to temperature, rich in unde

The frozen soil refers to under zero ℃, and contain various rocks and soil of the ice. Can generally be divided into the frozen soil and the frozen soil for many years (from several years to more than several ten thousand years) of frozen soil and season in short-term. The frozen soil is that one ki