• n. 永久凍土，永久凍地；永久凍結(jié)帶；永久冰凍

縮寫自permanent frost.

permafrost (n.)

1943, coined in English by Russian-born U.S. geologist Siemon W. Muller (1900-1970) from perm(anent) frost.

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.

來自辭典例句

2. This is the vegetational climate of arctic permafrost regions.

這是北極永凍地區(qū)的植物氣候.

來自辭典例句

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.

來自辭典例句

4. It became entombed in the permafrost, where it remained until recently freed.

它被掩埋在永久凍土層里, 直到最近才被挖掘出來.

來自互聯(lián)網(wǎng)

5. An example of a tipping point is the thawing of the permafrost.

“氣候引爆點(diǎn)”的一個(gè)例子就是永久凍土層的融化.

來自互聯(lián)網(wǎng)