| 词汇 | permafrost |
| 释义 | permafrost noun[ U ] environment specializeduk /ˈpɜː.mə.frɒst/ us /ˈpɝː.mə.frɑːst/ an area of land that is permanently frozen below the surface永冻层，永冻土层 Precipitation: snow & ice anti-icing avalanche be snowed inidiom be snowed upidiom boilerplate crevasse drifting glacier hailstorm iceberg icy precipitation sleet slushy snow day snow devil snow line snowdrift snowfall snowflake generation Examples of permafrostpermafrost Spilt fuel oil, however, had quickly migrated laterally across the permafrost surface, which in this case was firmly ice-cemented. Microbial communities in permafrost samples were investigated by in-situ techniques of lipid microbial biomarkers analyses. Permafrost: a guide to frozen ground in transition. Often permafrost has disappeared because the geothermal heat flux is slightly greater than elsewhere. All excavations were filled back and levelled to prevent permafrost degradation. Few nuclear specialists know much about permafrost, and vice-versa. However, in one site hydrocarbons were detected to a depth of 70 cm into the permafrost. Mars is thus shown to have an ice-rich soil forming a permafrost layer. Another option is to select the permafrost layer and observe the various types and extent of permafrost. Therefore, freeze-thaw of both pristine permafrost and tundra soil samples in complete darkness with only temperature fluctuations were run. Ice-cemented permafrost restricts the downward movement of most contaminants but may aid distribution via lateral flow, especially low-freezing-point contaminants such as hydrocarbons. The received results do not contradict the available data on the presence of living organisms in permafrost and expand our knowledge in this area. These include the possibility of unfrozen water in the permafrost due to solutes. The solid phase (ice) makes up most of the total water volume in permafrost and serve as a conservator for biological objects. Studies of life in terrestrial permafrost in comparison with other data from environmental ecology gives strong evidence that microbial life on this planet is ubiquitous. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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