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Millennia is the plural of 'millennium' — it means periods of a thousand years, usually more than one. Scientists and historians use it when they talk about very long stretches of time, much longer than a single human life.
千年（millennium 的複數）
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
millennianoun
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a single period of 1000 years, a millennium
- Could its existence mean the ancient Greeks knew the Earth moved round the Sun more than a millennia before Copernicus brought it to the world in the sixteenth century?
- In ancient Egypt, at the turn of the first millennia, animal mummies were produced in vast numbers as offerings to the pantheon of gods.
這個拼法也被記錄為下列字的變化形：
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。