aeon [ˈi:ən]

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n.极长的时间；永久

mainly UK for eon

Aeons ago, there were deserts where there is now fertile land. 现在是肥沃土地的地方在很久很久以前曾是一片片沙漠。
Aeon on aeon thou existed in beauty. 你永世永世活在美里。