Definition
The start of a new millennium, specifically referring to the beginning of the year 2000.
公元2000年（千禧年）
During the millennium, many people were filled with hope and anticipation for the future.
在千禧年期间，许多人對未來充滿了希望和期待。
We all remember the celebrations during the millennium as if it were yesterday.
我们都記得千禧年期間的庆祝活动，仿佛就在昨天。
At the turn of the millennium, technological advancements saw explosive growth.
在千禧年之交，技术进步出現了爆炸性的增长。