殚精竭虑 devote oneself completely
Explanation
殚精竭虑，意思是耗尽精力，费尽心思。形容为某事操尽了心力，想尽了办法。
Dānjīngjiélǜ means to exhaust one's energy and thoughts. It describes someone who has devoted all their energy and thought to something.
Origin Story
话说唐朝时期，有个名叫李白的诗人，他为了创作出传世佳作，殚精竭虑地思考着诗歌的意境和表达方式。他常常夜不成寐，反复推敲每一个字句，力求做到精益求精。为了寻找灵感，他游历名山大川，观察自然风物，感受人间百态。他翻阅大量的书籍，汲取古今诗词的精华。他与文人墨客交流心得，互相切磋。最终，他创作出了许多千古流传的诗篇，如《梦游天姥吟留别》、《将进酒》等。他的诗歌，豪放飘逸，充满浪漫主义色彩，至今仍被人们传颂。李白的故事，告诉我们，只要肯付出，肯努力，就一定能取得成功。
During the Tang Dynasty, there was a poet named Li Bai. In order to create enduring masterpieces, he devoted himself to his work, thinking day and night about the artistic conception and expression of his poems. He often couldn't sleep at night, and he repeatedly pondered and refined every single word and phrase, striving for excellence. To find inspiration, he traveled to famous mountains and rivers, observing natural scenery and the human experience. He read a large number of books, drawing from the essence of ancient and modern poetry. He exchanged ideas and learned from other scholars and poets. Eventually, he created many poems that have been passed down through the ages, such as "A Dream Journey to Mount Tianmu" and "Invitation to Wine". His poems are bold, elegant, full of romanticism, and are still recited by people today. Li Bai's story tells us that as long as we are willing to pay the price and make the effort, we will achieve success.
Usage
通常作谓语、状语，用于书面语，多形容为完成某事付出了巨大的努力。
Usually used as a predicate or adverbial modifier in formal writing, often to describe the great effort put into accomplishing something.
Examples
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他为了完成这个项目，殚精竭虑，夜以继日地工作。
tā wèile wánchéng zhège xiàngmù, dānjīngjiélǜ, yèyǐjìrì de gōngzuò。
He worked day and night, devoting all his energy to finishing the project.
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为了这次考试，他殚精竭虑，复习了很久。
wèile zhè cì kǎoshì, tā dānjīngjiélǜ, fùxíle hěn jiǔ。
He studied hard for a long time, putting all his efforts into the upcoming exam.