1·Beneath this active layer is a second layer called "permafrost", which is frozen all year around, and is impermeable to water.
在这一活跃层下面，是被称为“多年冻土”的第二层，终年冻结，不透水。
2·Russia, however, expects to profit handsomely: its steppes, freed of permafrost, will soon host vast olive groves; a series of pipelines will send extra-virgin supplies westwards.
而俄罗斯期望获取可观的利润：其多年冻土释放后的干草原，将很快布满大量的橄榄树；一系列的管道将把特级初榨橄榄油向西输送。
3·Permafrost is defined as any ground that has stayed below freezing for more that two consecutive summers.
多年冻土是指任何连续两个夏天处于冰点以下的地面。
4·Permafrost Photo: Dentren at en.wikipedia / cc – by – sa 3.0
多年冻土图片：Dentren at en.wikipedia / cc – by – sa 3.0
5·In this thesis, the author systemically study on the asphalt pavement design technology of the permafrost area from the material and the structure.
本文从路面材料和结构两方面，对多年冻土地区沥青路面设计技术进行系统深入的研究。
1·The analysis found that glaciers in every continent have been shrinking, permafrost is melting, the peak of river levels in spring is shifting, and lake and river temperatures are rising.
该分析发现，所有的大陆冰川已经在缩减，永久冻结带正在融化，春季水平面高度在改变，湖泊河流温度也在上升。