聚精会神 engrossed
Explanation
形容注意力高度集中，精神全部贯注在一个目标上。
It describes a state of intense concentration, where all one's mental energy is focused on a single objective.
Origin Story
话说唐朝时期，一位名叫李白的著名诗人，正坐在书房里挥毫泼墨，创作一首气势磅礴的诗歌。他聚精会神，笔走龙蛇，仿佛整个世界都融入了他的诗篇之中。窗外，鸟儿欢快地歌唱，风儿轻轻地吹拂着树叶，但李白全然不觉，他的心思早已飞越千山万水，沉浸在诗歌的意境里。他时而眉头紧锁，苦思冥想，时而喜笑颜开，灵感涌现。笔尖如游龙般在宣纸上舞动，一幅幅优美的画面，一个个动人的故事，尽在他的笔端流淌而出。几个时辰过去了，李白终于完成了这首气势恢宏的诗歌，长舒一口气，脸上露出了满足的笑容。这时，他才发现，夕阳西下，夜幕降临。
During the Tang Dynasty, a famous poet named Li Bai was sitting in his study, writing a magnificent poem with his brush. He was engrossed in his work, the brush dancing across the paper as if the whole world was reflected in his verse. Outside, birds sang happily and the wind gently rustled the leaves, but Li Bai didn't notice—his mind had flown over mountains and rivers, immersed in the poetic realm. Sometimes he frowned, lost in thought, sometimes he smiled broadly, inspiration flooding him. His pen danced on the paper like a dragon, beautiful images and moving stories flowing effortlessly from his hand. Hours passed, and finally Li Bai finished his grand poem, letting out a long sigh of satisfaction. Only then did he notice the sun setting and night approaching.
Usage
用于形容人精神高度集中，注意力全部放在某件事情上。
It is used to describe someone who is highly concentrated and whose attention is entirely focused on something.
Examples
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他聚精会神地写着论文。
ta ju jing hui shen de xie zhe lunwen
He was engrossed in writing his paper.
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孩子们聚精会神地听着老师讲故事。
haizi men ju jing hui shen de ting zhe laoshi jiang gushi
The children listened attentively as the teacher told a story.
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手术进行中，医生聚精会神地操作着手术器械。
shoushu jin xing zhong, yisheng ju jing hui shen de caozuo zhe shoushu qixi
During the operation, the doctor was focused on operating the surgical instruments.