se perfectionner

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.
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.
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