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adj.太古代的; 英英释义: Archean[ ɑ:'ki:ən ]n.the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life同义词:Archean eonArchean aeonArcheozoicArchaeozoicArcheozoic eonArchaeozoic aeonadj.used