This is the 4469th most frequent Polish word.
klucze
"Klucze" means "keys" in English.
In this sentence, 'kluczy' refers to physical keys used to unlock a door.
Potrzebuję kluczy do tego pokoju.
I need the keys to this room.
Here, 'klucza' is used metaphorically to indicate a critical aspect or solution to a problem.
Nie mogę znaleźć klucza do rozwiązania tego problemu.
I can't find the key to solving this problem.
In this usage, 'klucze' refers again to physical keys, specifying their location in relation to the apartment.