| 单词 | 层土壤 |
| 释义 | 〔permafrost〕Permanently frozen subsoil, occurring throughout the Polar Regions and locally in perennially frigid areas.永冻土：永久冰冻的下层土壤，出现在整个北极地区和部分长期寒冷的地区〔illuviation〕The deposition in an underlying soil layer of colloids, soluble salts, and mineral particles leached out of an overlying soil layer.淀积作用：胶状物，可溶性盐和矿物微粒从上层土壤向下层过滤的沉淀过程 |
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