1 文書を見つけるための辞書。

• archean eon, archaeozoic, archeozoic eon, archeozoic, archean, archean aeon, archaeozoic aeon
• 太古代
• the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
• 38億年前から25億年前までの期間