一分一毫 one cent, one milliliter
Explanation
一分一毫，指的是非常少、微不足道的数量，形容极其细微，不放过任何一点。这个成语强调做事要细致认真，不能马虎大意。
One cent, one milliliter, refers to a very small, insignificant amount, describing something extremely subtle and not letting go of any little thing. The idiom emphasizes that one should be meticulous and conscientious in doing things and not be careless.
Origin Story
在古代，有一个勤俭持家的妇人，她总是把每一分一毫都用在刀刃上，从不乱花一分钱。她每天都会把家里所有的小物件都擦拭得干干净净，连一根针掉在地上她都舍不得丢掉。她教育她的孩子要像她一样，勤俭节约，不要浪费一分一毫。她的孩子也继承了她勤俭的品质，长大后成为一个富有的人，但依然保持着节俭的习惯，把每一分一毫都用在了慈善事业上。
In ancient times, there was a thrifty and frugal woman who always used every penny wisely and never spent a single penny wastefully. Every day, she would wipe clean all the little objects in her house, and even if a needle fell to the ground, she wouldn’t throw it away. She taught her children to be as diligent and frugal as she was, not to waste a single penny. Her children also inherited her thrifty qualities and grew up to be wealthy people, but still maintained their frugal habits and used every penny for charitable purposes.
Usage
这个成语主要用来形容对金钱的珍惜和节俭的态度，也可以用来比喻对时间或其他资源的珍惜。
This idiom is mainly used to describe the appreciation for money and the frugal attitude, but it can also be used to metaphorically express the appreciation for time or other resources.
Examples
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我们应该珍惜每一分一毫的时间，努力学习。
wo men ying gai zhen xi mei yi fen yi hao de shi jian, nu li xue xi.
We should cherish every minute and every second, and study hard.
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他生活俭朴，从不浪费一分一毫。
ta sheng huo jian pu, cong bu lang fei yi fen yi hao.
He lives simply and never wastes a penny.
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这笔钱虽然不多，但也是一分一毫辛苦赚来的。
zhe bi qian sui ran bu duo, dan ye shi yi fen yi hao xin ku zhuan lai de.
Although this money is not much, it is every penny earned with hard work.