Frost crack is the main failuve of asphalt pavement in permafrost region.
冻裂是多年冻土地区沥青路面的主要病害。
The disease of subgrade in permafrost region was mainly induced by frost heaving and thawing circulation of frozen soils because of change of seasons.
多年冻土地区路基病害主要由冻土土体在季节变化条件下的冻融循环造成的。
During winter, carbon dioxide condenses out of the atmosphere and forms a frost of dry ice that coats the planet's polar region.
在冬季时，二氧化碳脱离大气冷凝成固体二氧化碳(干冰)覆盖在星球的极地地区。
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