permafrost

permafrost

英 ['pɜːməfrɒst]
　　美 ['pɝməfrɔst]

n. 永久凍土，永久凍地；永久凍結帶；永久冰凍

中文詞源：

permafrost 永凍土

縮寫自permanent frost.

例句：

1. Perhaps this is caused by the sudden melting of subsurface permafrost.
可能是地下永久凍土突然融化所造成.

2. This is the vegetational climate of arctic permafrost regions.
這是北極永凍地區的植物氣候.

3. The harder the material under the permafrost is, the larger the chamber charge required.
永凍層之下的土壤越硬, 所需要的藥室裝藥量也越大.

4. It became entombed in the permafrost, where it remained until recently freed.
它被掩埋在永久凍土層裡, 直到最近才被挖掘出來.

5. An example of a tipping point is the thawing of the permafrost.
“氣候引爆點”的一個例子就是永久凍土層的融化.