| 单词 | permafrost |
| 释义 | permafrost noun[U] environmentspecializeduk/ˈpɜː.mə.frɒst/us/ˈpɝː.mə.frɑːst/anareaoflandthat ispermanentlyfrozenbelow thesurface 永冻层，永冻土层Precipitation: snow & ice
Examplesofpermafrostpermafrost Spilt fuel oil, however, had quickly migrated laterally across thepermafrostsurface, which in this case was firmly ice-cemented. From theCambridge English Corpus Microbial communities inpermafrostsamples were investigated by in-situ techniques of lipid microbial biomarkers analyses. From theCambridge English Corpus Permafrost: a guide to frozen ground in transition. From theCambridge English Corpus Oftenpermafrosthas disappeared because the geothermal heat flux is slightly greater than elsewhere. From theCambridge English Corpus All excavations were filled back and levelled to preventpermafrostdegradation. From theCambridge English Corpus Few nuclear specialists know much aboutpermafrost, and vice-versa. From theCambridge English Corpus However, in one site hydrocarbons were detected to a depth of 70 cm into thepermafrost. From theCambridge English Corpus Mars is thus shown to have an ice-rich soil forming apermafrostlayer. From theCambridge English Corpus Another option is to select thepermafrostlayer and observe the various types and extent ofpermafrost. From theCambridge English Corpus Therefore, freeze-thaw of both pristinepermafrostand tundra soil samples in complete darkness with only temperature fluctuations were run. From theCambridge English Corpus Ice-cementedpermafrostrestricts the downward movement of most contaminants but may aid distribution via lateral flow, especially low-freezing-point contaminants such as hydrocarbons. From theCambridge English Corpus The received results do not contradict the available data on the presence of living organisms inpermafrostand expand our knowledge in this area. From theCambridge English Corpus These include the possibility of unfrozen water in thepermafrostdue to solutes. From theCambridge English Corpus The solid phase (ice) makes up most of the total water volume inpermafrostand serve as a conservator for biological objects. From theCambridge English Corpus Studies of life in terrestrialpermafrostin comparison with other data from environmental ecology gives strong evidence that microbial life on this planet is ubiquitous. From theCambridge English Corpus 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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