如鱼得水 like a fish in water
Explanation
比喻人或事物处于最适合自己的环境，能充分发挥才能或优势，就像鱼在水里一样自由自在、游刃有余。
A metaphor used to describe someone or something that is in their best environment, able to fully utilize their talents or strengths, just like a fish swimming freely and effortlessly in water.
Origin Story
传说，当年刘备三顾茅庐，终于请到了诸葛亮出山。诸葛亮为刘备出谋划策，帮助刘备夺取天下，成为三国鼎立的蜀汉政权。刘备感叹地说：“我得到诸葛亮，就像鱼得到水一样，终于找到了可以依靠的人。”
Legend has it that Liu Bei, the founder of the Shu Han kingdom, visited Zhuge Liang's cottage three times to persuade him to come out of retirement. Zhuge Liang, a brilliant strategist, helped Liu Bei conquer the world and establish the Shu Han kingdom, one of the Three Kingdoms. Liu Bei exclaimed, “I have found Zhuge Liang, just like a fish has found water. I have finally found someone I can rely on.
Usage
这个成语用来形容一个人或事物在某一方面非常擅长，或者说找到了最适合自己的环境。
This idiom is used to describe someone or something that is very good at something, or to say that they have found the perfect environment for them.
Examples
-
他终于找到了一个如鱼得水的环境，工作起来得心应手。
tā zhōng yú zhǎo dào le yī ge rú yú dé shuǐ de huán jìng, gōng zuò qǐ lái dé xīn yìng shǒu.
He has finally found a work environment where he feels like a fish in water, and his work is effortless.
-
在音乐领域，她如鱼得水，才华横溢。
zài yīn yuè lǐng yù, tā rú yú dé shuǐ, cái huá héng yì.
She's like a fish in water in the music field, full of talent.
-
这支球队的新教练很了解球员，在他的带领下，球队如鱼得水，战绩连连攀升。
zhè zhī qiú duì de xīn jiào liàn hěn liǎo jiě qiú yuán, zài tā de dǎo liǎn xià, qiú duì rú yú dé shuǐ, zhàn jì lián lián pān shēng.
The team's new coach knows the players well. Under his leadership, the team is like a fish in water, and their results have been improving steadily.
-
在这次会议上，他如鱼得水，谈笑风生，展现出非凡的领导才能。
zài zhè cì huì yì shàng, tā rú yú dé shuǐ, tán xiào fēng shēng, zhǎn xiàn chū fēi fán de lǐng dǎo cái néng.
He felt like a fish in water at this meeting, chatting and joking, showing extraordinary leadership.