Precambrian

详细解释:n. 前寒武纪, 前寒武纪岩

英语解释：

名词 precambrian:

the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago同义词：Precambrian eon, Precambrian aeon, Precambrian period