专心致志 focused
Explanation
专心致志的意思是集中注意力，全神贯注地去做某事。形容一心一意，聚精会神。
The idiom means to concentrate one's attention and devote oneself entirely to something. It describes someone who is completely focused and puts their whole effort into something.
Origin Story
弈秋是战国时期著名的围棋高手，他收了两个学生。他认真地讲解围棋的技巧和策略，第一个学生专心致志地听讲，仔细琢磨，而第二个学生却心不在焉，一会儿看天上的飞鸟，一会儿看地上的小虫，根本没把弈秋的话听进去。后来，弈秋让两个学生下棋，结果第一个学生技高一筹，而第二个学生则输得一塌糊涂。这个故事告诉我们，做任何事情都要专心致志，才能取得成功。
Yi Qiu was a famous Go player during the Warring States period. He took on two students. He carefully explained the techniques and strategies of Go. The first student listened attentively and pondered carefully, while the second student was distracted, looking at the birds in the sky and insects on the ground, and not listening to Yi Qiu's words. Later, Yi Qiu let the two students play Go, and the first student won easily, while the second student lost badly. This story teaches us that to be successful in anything, we must be focused and attentive.
Usage
专心致志通常用作谓语、定语或状语，形容人做事全神贯注、一心一意的状态。
"Concentrated" is usually used as a predicate, attributive, or adverbial, describing a person's state of being fully focused and dedicated to something.
Examples
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他学习非常专心致志。
tā xuéxí fēicháng zhuānxīnzhìzhì
He is very focused on his studies.
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为了完成这项任务，她专心致志地工作了三个月。
wèile wánchéng zhè xiàng rènwù, tā zhuānxīnzhìzhì de gōngzuò le sān gè yuè
She worked diligently for three months to complete this task.
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他专心致志地练习书法，一练就是几个小时。
tā zhuānxīnzhìzhì de liànxí shūfǎ, yī liàn jiùshì jǐ gè xiǎoshí
He practices calligraphy with great concentration for several hours at a time.