| 单词 | permafrost |
| 释义 | permafrost (once / 35177 pages) n Permafrost is ground that is frozen permanently. As you can imagine, permafrost is extremely cold. If you know that frost has many cold-related meanings and permanent means "always," then you should be able to figure out what permafrost is: ground that is permanently frozen. You won't be able to plant a garden in permafrost — or do much with it — since it’s so hard and cold. You won't find permafrost in warm climates or places that have distinct seasons. Permafrost only exists in areas where it's cold all the time, so the ground never thaws out. WORD FAMILYpermafrost USAGE EXAMPLESIndustry and tourism in the region are tiny, though mining and oil companies continue to eye-up potential sites as the permafrost retreats. The Guardian(Dec 21, 2016) If this is allowed to happen, the resulting increase in emissions could raise temperatures enough to thaw permafrost - frozen soil, rock or sediment. Reuters(Nov 17, 2016) In Siberia, they see hayfields that are underwater because of the thawing of the permafrost layer. New York Times(Nov 10, 2016) n ground that is permanently frozen Hyper ground, land, soil material in the top layer of the surface of the earth in which plants can grow (especially with reference to its quality or use) |
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