名詞 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
   同義詞：Precambrian eon, Precambrian aeon, Precambrian period

Pre.cam.bri.an

adj.（形容詞）
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
前寒武紀(jì)的：地質(zhì)年代中最古老和最大的階段的、屬于這一階段的或處于這一階段的，其前為寒武紀(jì)期，寒武紀(jì)期又可細(xì)分為始生代和原生代，特征為原始生命形式的出現(xiàn)參見 geologic time
n.（名詞）
The Precambrian Era.
前寒武紀(jì)時(shí)代