the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
Adjective:
of or relating to the earliest known rocks formed during the Precambrian Eon
双语例句
用作形容词 (adj.)
On seeing the rocks for himself, Fedo, who had just spent a year mapping Archean rocks in Zimbabwe, became extremely skeptical. 另一方面，费多由于才刚在辛巴威花了一年时间测定太古代的岩石，现在他亲眼看见这里的岩石，立刻感到非常怀疑。
