千秋万世 thousands of autumns and tens of thousands of generations
Explanation
指时间悠久，很久远。也用来赞扬帝王功德伟大，永远流传。
Refers to a long, very long time. It is also used to praise the great achievements of rulers that will last forever.
Origin Story
话说上古时期，大禹治水，为民除害，造福一方百姓。他的功绩传颂千秋万世，人们为了纪念他，建起了大禹庙，至今香火不断。这便是千秋万世的来历。后世帝王，也希望自己的功绩能够流芳百世，以千秋万世来形容，是一种美好的愿望。
In ancient times, Dayu controlled the flood, saving the people and benefiting the people in one area. His achievements have been passed down for thousands of years, and to commemorate him, Dayu Temple was built, and the incense is still burning today. This is the origin of 'thousands of years and tens of thousands of generations'. Later rulers also hoped that their achievements would be passed down for hundreds of generations, and the description of 'thousands of years and tens of thousands of generations' is a beautiful wish.
Usage
用于表达时间悠久或赞扬功绩伟大。
Used to express a long time or praise great achievements.
Examples
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大禹治水，功在千秋万世。
dayu zhishiui gongzai qianqiuanwan shi
Dayu's flood control work benefits the ages.
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他的功绩将流芳千秋万世。
tade gongji jiangliufang qianqiuwanshi
His achievements will be passed down through the ages.