s'est perfectionné
-he improved
Passé composé il/elle conjugation of se perfectionner.

se perfectionner

Comme tous les sports, le hockey s'est perfectionné.
Like everything else, hockey's gone hi-tech.
Faites frire la torréfaction de casserole est devenu beaucoup moins populaire quand du café pré-rôti par cachetage de vide s'est perfectionné.
Fry pan roasting became much less popular when vacuum sealing pre-roasted coffee was perfected.
Le système de vérification des Nations Unies a constamment évolué et s'est perfectionné à l'usage et au fil d'un apprentissage permanent.
The United Nations verification system constantly evolved and developed with experience and through ongoing training.
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