permafrost中文什么意思

n.
【地质学；地理学】永久冻土。

• passive permafrost; fossil permafrost:    死永冻土
• active permafrost:    活动性永久冰层; 再生永动土
• aggradation of permafrost:    永动土增生

例句与用法

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1. This is the vegetational climate of arctic permafrost regions .
   这是北极永冻地区的植物气候。
2. 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。
3. The harder the material under the permafrost is, the larger the chamber charge required .
   永冻层之下的土壤越硬，所需要的药室装药量也越大。
4. 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。
5. Heat - bar construction technique on permafrost areas
   多年冻土地区热棒施工技术

英文释义

名词

1. ground that is permanently frozen

百科释义

In geology, permafrost or cryotic soil is soil at or below the freezing point of water for two or more years. Most permafrost is located in high latitudes (i.