如魚得水

like a fish back in water (idiom); glad to be back in one's proper surroundings

as / as if / such as

surname Yu

fish / CL:條|条[tiao2],尾[wei3]

to obtain / to get / to gain / to catch (a disease) / proper / suitable / proud / contented / to allow / to permit / ready / finished

structural particle: used after a verb (or adjective as main verb), linking it to following phrase indicating effect, degree, possibility etc

to have to / must / ought to / to need to

surname Shui

water / river / liquid / beverage / additional charges or income / (of clothes) classifier for number of washes