积年累月 Years and Months
Explanation
指经过许多年月，时间很长。
Refers to a long period of time, spanning many years and months.
Origin Story
从前，在一个偏僻的山村里，住着一位名叫老张的木匠。老张技艺精湛，他制作的木器不仅结实耐用，而且造型美观，深受村民们的喜爱。然而，老张最得意之作，却是一把精雕细琢的木梳。这把木梳，他前后花了积年累月的时间，才最终完成。梳子上雕刻着各种精美的图案，栩栩如生，令人叹为观止。这把木梳的价值远超一般的木器，它代表着老张毕生的心血和技艺。当村民们看到这把木梳时，都啧啧称赞，纷纷表示要买下它。可是，老张却说：“这把木梳，我不卖，它是我留给子孙后代的传家宝。”老张的这把木梳，不单单是一件木器，更是一段积年累月的故事，一段对技艺的传承与追求。
Once upon a time, in a remote mountain village, lived a carpenter named Lao Zhang. Lao Zhang was a master craftsman, his wooden works not only sturdy and durable, but also beautifully designed, and were deeply loved by the villagers. However, Lao Zhang's most proud work was a meticulously crafted wooden comb. This comb took him many years to complete. The comb was carved with various exquisite patterns, vivid and breathtaking. The value of this comb far exceeded that of ordinary wooden wares; it represented Lao Zhang's life's work and skill. When the villagers saw the comb, they praised it and wanted to buy it. But Lao Zhang said, "This comb, I won't sell it; it's a family heirloom that I will leave to my descendants." Lao Zhang's wooden comb was not just an ordinary wooden article, but also a story told over many years – a story of skill, inheritance, and pursuit.
Usage
常用来形容时间很长，也指经过长时间的积累。
Often used to describe a long period of time, or to describe the accumulation over a long time.
Examples
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经过积年累月的努力，他终于完成了这部巨著。
jing guo jī nián lěi yuè de nuli, ta zhongyu wancheng le zhe bu ju zhu
After years of hard work, he finally completed this masterpiece.
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经过积年累月的学习，他的知识水平有了很大的提高。
jing guo jī nián lěi yuè de xuexi, ta de zhishi shuiping you le hen da de ti gao
After years of study, his knowledge level has greatly improved