毫发不爽 not a hair's breadth out
Explanation
形容一点不差，非常准确。
Describes something as completely accurate, without the slightest error.
Origin Story
话说唐朝时期，有一位名叫李白的著名诗人，他非常擅长写诗，而且他的诗作总是能够恰如其分地表达出他想表达的情感和意境。有一次，皇帝要他为庆祝宫廷盛宴创作一首诗，李白欣然答应。他闭门谢客，精心构思，最终写出了一首令所有人惊艳的诗作。这首诗词藻华丽，韵律优美，而且能够完美地展现出盛宴的繁华热闹和宫廷的富丽堂皇。皇帝看后龙颜大悦，赞不绝口，并夸赞李白的诗作毫发不爽，精准地捕捉到了盛宴的精髓。从此，“毫发不爽”便成为了人们用来形容非常准确、一丝不苟的经典成语。
In the Tang Dynasty, there was a famous poet named Li Bai, who was exceptionally skilled in writing poetry. His poems always accurately expressed the emotions and atmosphere he intended to convey. Once, the emperor commissioned him to write a poem for a grand court banquet. Li Bai readily accepted the task, secluded himself, and carefully crafted his work, ultimately creating a poem that left everyone in awe. The poem was rich in imagery and beautiful in rhythm, perfectly capturing the splendor and grandeur of the banquet and the imperial court. The emperor was delighted, praising Li Bai's work effusively and commending its precision. From then on, "毫发不爽" became a classic idiom to describe something extremely accurate and meticulous.
Usage
形容非常准确，一点儿也不差。常用来形容计算、描述、预言等方面的准确性。
Describes something as very accurate, without any error. Often used to describe the accuracy of calculations, descriptions, or predictions.
Examples
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他的计算精确无误，毫发不爽。
tā de jìsuàn jīngquè wúwù, háofà bù shuǎng
His calculations were precise and accurate.
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这次考试，他答题一丝不苟，毫发不爽地完成了试卷。
zhè cì kǎoshì, tā dá tí yīsī bùgǒu, háofà bù shuǎng de wánchéng le shìjuàn
In this exam, he answered the questions meticulously and completed the paper without any mistakes..