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the + ordinal + millennium
millennium 前用序数词表示第几个一千年，如 the second millennium（第二个千年）。
The third millennium has brought many technological changes.
第三个千年带来了许多科技变革。
一千年；千年
先理解核心含义，再看它在真实句子里的用法。
一千年；千年
A period of one thousand years.
The third millennium has brought many technological changes.
第三个千年带来了许多科技变革。
一千年；千年期
A period of time consisting of one thousand years.
一千年
a span of 1000 years
(《新约·启示录》)预言忠实于耶稣者将与其在地球上统治千年；该含义多有争议；一些教派(如耶和华见证人)视之为公正、和平、幸福的千年
(New Testament) in Revelations it is foretold that those faithful to Jesus will reign with Jesus over the earth for a thousand years; the meaning of these words have been much debated; some denominations (e.g. Jehovah's Witnesses) expect it to be a thousand years of justice and peace and happiness
一千周年纪念(或庆祝活动)
the 1000th anniversary (or the celebration of it)
The first millennium of the Common Era ended in the year 1000.
公元第一个千年在公元1000年结束。
We looked back at the changes that occurred over the past millennium.
我们回顾了过去一千年中发生的变化。
Human knowledge has grown exponentially over the last few millenniums.
人类知识在过去几千年里呈指数级增长。
millennium 前用序数词表示第几个一千年，如 the second millennium（第二个千年）。
The third millennium has brought many technological changes.
第三个千年带来了许多科技变革。
此结构中的 millennium 指某事件发生满一千年，即一千周年纪念。
The city held a celebration to mark the millennium of its founding.
这座城市举行了庆祝活动，纪念其建城一千周年。
millennium 的复数可以是 millennia 或 millenniums，两者都正确。
This tradition has been kept for two millennia.
这一传统已经延续了两千年。
Not this
The building has survived for millennium.
Use this
The building has survived for a millennium.
millennium 是可数名词单数，前面需要加冠词 a；汉语没有冠词，所以学习者容易漏掉。
Not this
This millennia has been a time of rapid change.
Use this
This millennium has been a time of rapid change.
millennia 是 millennium 的复数形式，不能当单数用；单数主语要用 millennium，谓语用 has。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
新千年；新千禧年
People around the world celebrated the start of the new millennium.
世界各地的人们庆祝新千年的开始。
千年之交；千禧年之际
She was born around the turn of the millennium.
她大约在千禧年之交出生。
千年发展目标
The United Nations set eight Millennium Development Goals in 2000.
联合国在2000年制定了八项千年发展目标。
千年虫（计算机日期问题）
Companies spent millions fixing the millennium bug before 2000.
公司在2000年之前花费数百万美元修复千年虫。
庆祝千禧年
The city hosted a huge fireworks display to celebrate the millennium.
这座城市举办了盛大的烟花表演来庆祝千禧年。
数千年以来
Humans have used herbs for millennia.
人类使用草药已有数千年之久。
你从来没听说过千年隼号吗？
Han Solo says this in Star Wars: A New Hope (1977), after Luke calls his ship a piece of junk. The Millennium Falcon is one of the most famous spaceships in pop culture.
汉·索罗在1977年的《星球大战：新希望》中说了这句话，因为卢克把他的飞船叫作“一堆破铜烂铁”。千年隼号是流行文化中最著名的飞船之一。
Use millennium naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记 millennium：千禧年倒计时庆祝的就是整整一千年，想象跨年钟声敲响那一刻，仿佛见证了一千年的流转。
语域：neutral 常见场景：historical writing、news reports about the year 2000、religious studies、formal anniversary speeches 该词属中性偏正式，通常多用于书面语或较正式场合，如历史叙述、新闻报道、宗教研究或纪念性演讲；日常口语中不算高频。使用时请根据上下文判断具体含义。
没有常见英文单词与 millennium 完全押韵。以上词主要用于拼写对比：-ennial 类词（millennial、perennial、bicentennial）结尾读 /iəl/ 而非 /iəm/；-nium 类词（geranium、uranium、pandemonium）的重读元音也不同，因此都不是押韵词。
Dictionary facts from ECDICT, WIKTIONARY.