Chinese Idiom 101

如鱼得水 (rú yú dé shuǐ): 

Meaning: Literally “like a fish in water,” it indicates that someone is in a favourable environment where they can thrive.

Usage: Used to describe someone who is thriving in a role, relationship, or situation.

Example:
"她刚加入团队就如鱼得水，表现得非常出色。"
(tā gāng jiā rù tuán duì jiù rú yú dé shuǐ, biǎo xiàn de fēi cháng chū sè)
— "She joined the team and immediately felt at home, performing brilliantly."