皓首穷经 To study diligently until old age
Explanation
皓：白色；首：头发；穷：穷尽，彻底；经：经典，指古代的经书。形容人年老了，还在专心研究经典书籍。比喻专心致志，刻苦钻研。
Hào: white; Shǒu: hair; Qióng: exhaust, thorough; Jīng: classics, referring to ancient scriptures. Describes a person who is still diligently studying classic books even in old age. A metaphor for dedication and diligent research.
Origin Story
话说唐朝时期，长安城里住着一位名叫李白的书生，自幼酷爱读书，家中藏书无数。他博览群书，对各种典籍都颇有研究，尤其对古代诗词情有独钟。年复一年，他废寝忘食地研读，常常挑灯夜战，即使到了深夜也不肯休息。时间飞逝，李白已年过花甲，两鬓斑白，但他对知识的追求却从未停止。他仍然坚持每天研读经典，并将其中的精髓融会贯通，最终成为了一代大儒。他皓首穷经的故事，一直被后人传颂，激励着无数学子奋发向上。
During the Tang Dynasty, a scholar named Li Bai lived in Chang'an city. He loved reading since childhood and had countless books in his home. He read extensively and was well-versed in various scriptures, especially ancient poetry. Year after year, he studied day and night, often burning the midnight oil, even until late at night he was unwilling to rest. Time flew, Li Bai was over sixty years old, his temples were gray, but his pursuit of knowledge never stopped. He still insisted on reading classics every day and integrated their essence, eventually becoming a great scholar. His story of diligently studying classics even with white hair has been passed down through the ages, inspiring countless students to strive for excellence.
Usage
用来形容人刻苦学习，直到老年。
Used to describe someone who studies diligently until old age.
Examples
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他皓首穷经，终于完成了这部巨著。
ta hao shou qiong jing, zhongyu wancheng le zhe bu juzhuo
He spent his whole life studying ancient texts, and finally completed this masterpiece.
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老教授皓首穷经，为国家培养了一大批人才。
lao jiaoshou hao shou qiong jing, wei guojia peiyang le yi da pi rencai
The old professor has dedicated his life to scholarship, cultivating many talented students for the country.