若干 (ruò gān): A certain number or amount (Pronoun) — Meaning & Stroke Order

Regarding this project, we still need to resolve a certain number of technical challenges.

Among those books you bought yesterday, are a certain number of them novels?

After a certain number of failed attempts, they finally found the correct method.

There are still a certain number of eggs and milk in the refrigerator, which should be enough for breakfast.