This is the 14753rd most frequent Polish word.
płynów
"Fluids" or "liquids."
In this sentence, 'płynów' is used in the genitive plural form to refer to 'fluids,' emphasizing its necessity in the context of health.
Powinniśmy pić dużo płynów, aby zachować dobre zdrowie.
We should drink plenty of fluids to maintain good health.
Here, 'płynów' again in the genitive plural form relates to 'liquids,' focusing on its use in scientific or analytical context.
Przeanalizowano próbki płynów pobranych z różnych źródeł.
Samples of liquids collected from various sources were analyzed.
In this sentence, 'płynów' refers to the various liquids present in a car (e.g., oil, coolant), again in the genitive plurality to indicate a collection of different fluid types.