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Archean a. 太古代的 太古代的 archean
adj 1: of or relating to the earliest known rocks formed during the Precambrian Eon [synonym: {archean}, {archaean}] n 1: the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life [synonym: {Archean}, {Archean eon}, {Archean aeon}, {Archeozoic}, {Archaeozoic}, {Archeozoic eon}, {Archaeozoic aeon}]
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