| 1. | Perhaps this is caused by the sudden melting of subsurface permafrost .
可能是地下永久冻土突然融化所造成。 |
| 2. | In permafrost areas in the soviet union or canada or alaska, ice has been used effectively for walling and roofing .
在苏联、加拿大或阿拉斯加的永久冻土地区，冰一直很有效地用来做墙和屋顶。 |
| 3. | As permafrost gets warmer , it could become wetlands
永久冻土变得更加温暖时，将变成湿地。 |
| 4. | The polar ice caps are made of frozen water and carbon dioxide , and water may be frozen in the ground as permafrost
极地冰帽是由固态水和二氧化碳组成的，水也有可能存在于永久冻土之中。 |
| 5. | When scientists fly into remote areas of siberia to study permafrost , they gaze down on an endless expanse of arctic lakes
当科学家们飞到遥远的西伯利亚研究永久冻土带时，他们发现了一处一直在膨胀的北极湖。 |
| 6. | In alaska , salmon populations are faltering as melting permafrost pours mud into rivers , burying the gravel the fish need for spawning
在阿拉斯加， ?鱼群的数量正在逐渐减少，因为永久冻土层融化带入大量的泥土到河中，覆盖了?鱼产卵所需的碎石。 |
| 7. | Slowly the carcass , more than four times the weight of a bull elephant , appears onto the ice to be cut up , dragged to the village and stored in pits in the permanently frozen ground
慢慢地，这头比四头公象还要重的鲸鱼一点点被拉到了冰面上，然后，被分割成小块，运到村里，储藏在永久冻土下的洞里。 |
| 8. | We are already seeing changes in rainfall ; an increase in the frequency and severity of extreme weather events ; melting sea ice and permafrost ; retreating glaciers
气温不断升高，降水量开始改变，极度恶劣的天气情况愈加频繁，破坏力也更大。海平面的冰块开始溶化，永久冻土也开始解冻，冰山开始消退。 |
| 9. | There are three main genetic types : ( 1 ) biogas generated in high - latitude and low - temperature permafrost zone : ( 2 ) biogas generated in high salinity environment in high elevation ; ( 3 ) biogas in shallow pay generated in recent sediment
其主要成因类型有3种：高纬度低温，永久冻土带下形成生物气；高海拔、高盐度环境下形成生物气；现代沉积物形成浅层生物气。 |
| 10. | Modernity , they proudly and not uncontroversially say , has arrived in this backward region in the form of an engineering miracle that has laid tracks on land gripped year - round by ice , a railway line at higher altitude than any other in the world
他们以骄傲且不容置疑的口吻说，在永久冻土上铺设铁轨是一个工程奇迹，而现代化已经由方式来到了这个不发达地区，这条线路的海拔比世界上另外任何一个地方都要高。 |
