What is the interpretation of the Almighty's saying: "and full-breasted maidens of equal age, and a full cup" “wa kawāʿiba atrāban wa kaʾsan dihāqan” (Surah An-Naba, 78:33–34)?

"Kawa'ib" is a characteristic of women, meaning those whose breasts have become rounded and firm like a 'ka'b' (a dice or an ankle bone) due to their strength and youthful freshness. Their plural is 'kawa'ib'. "Atraba" means of the same age, i.e., equal in age. "Ka'san Dihaqa" means a full cup.