Precambrian

名词 precambrian:

1. 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

Pre.cam.bri.an

adj.（形容词）
Of, belonging to, or being the oldest and largest division of geologic time, preceding the Cambrian Period, often subdivided into the Archeozoic and Proterozoic eras, and characterized by the appearance of primitive forms of life.See table at geologic time
前寒武纪的：地质年代中最古老和最大的阶段的、属于这一阶段的或处于这一阶段的，其前为寒武纪期，寒武纪期又可细分为始生代和原生代，特征为原始生命形式的出现参见 geologic time
n.（名词）
The Precambrian Era.
前寒武纪时代