This is the 14156th most frequent Russian word.
определенными
"Specific" or "certain."
Here, "определенными" refers to specific difficulties, emphasizing particular challenges without defining them.
Мы столкнулись с определенными трудностями при выполнении проекта.
We faced certain difficulties during the project implementation.
In this sentence, "определенные" indicates necessary skills that are somewhat specified or categorized.
Для успешного завершения задачи нужны определенные навыки.
Certain skills are required for the successful completion of the task.
The word "определенную" highlights the significant contribution of the team, although the extent of their role isn't fully quantified.