This is the 11716th most frequent Polish word.
koncentrują
"Koncentrują" means "they concentrate" or "they focus."
Here, 'koncentrują' (they focus) describes the act of paying careful attention to a specific activity or topic, which is studying for the exam.
Studenci koncentrują swoją uwagę na przygotowaniach do egzaminu.
The students are focusing their attention on preparing for the exam.
In this context, 'koncentrują się' (they focus themselves) denotes concentrating or directing efforts and thoughts towards an objective, which is the creation of greener products.
Projektanci koncentrują się na tworzeniu bardziej ekologicznych produktów.
The designers are focusing on creating more environmentally-friendly products.
Here, 'koncentrują' (they focus) implies applying efforts or energy in a specified way, in this case, to address and resolve realistic challenges.