一字千金 A word is worth a thousand gold
Explanation
“一字千金”是一个成语，比喻文章或字写得好，精妙绝伦，不可更改。
"A word is worth a thousand gold" is an idiom that means that a piece of writing is so well-written, so ingenious, that it is impossible to change.
Origin Story
战国时期，秦王嬴政年幼继位，由相国吕不韦辅政，为了笼络人心，增强实力，吕不韦组织人编写《吕氏春秋》，并把这一部10多万字的书挂在咸阳的门市上，宣布谁能指出书中不足，增加或删除其中一字者，赏给千金。这则故事体现了对文字的尊重和对文化传承的重视，也说明了精妙的文字是无价的，值得人们珍视。
During the Warring States period in China, the young King Ying Zheng ascended the throne and was supported by the Prime Minister Lü Buwei. To win over the hearts of the people and strengthen his power, Lü Buwei organized the compilation of the "Lüshi Chunqiu" (Chronicles of the Spring and Autumn Period by Lü). This work, containing more than 100,000 characters, was displayed at the gates of Xianyang. Lü Buwei announced that anyone who could find a flaw in the book, add or remove a word, would receive a reward of a thousand gold. This story reflects the respect for writing and the importance of cultural transmission. It also shows that masterful words are priceless and worth cherishing.
Usage
这个成语多用于形容文章或字写得精妙绝伦，不可更改。例如：这篇文章文笔精妙，简直是“一字千金”啊！
This idiom is often used to describe a piece of writing that is so well-written, so ingenious, that it is impossible to change. For example: "This article is so well-written, it's like "every word is worth a thousand gold".
Examples
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这篇文章文笔精妙，简直是“一字千金”啊！
zhe pian wen zhang wen bi jing miao, jian zhi shi yi zi qian jin a
This article is so well-written, it's like "every word is worth a thousand gold".
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他的演讲稿经过反复修改，可谓“一字千金”。
ta de yan jian gao jing guo fan fu xiu gai, ke wei yi zi qian jin
His speech was revised repeatedly and is therefore "every word is worth a thousand gold".