French translation: versions évoluées des catalyseurs Ziegler-Natta
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modèles ou versions récentes ou perfectionnées des c;
Explanation: Agree with Arrob on the explanation but I would rather go for either modèles récents (or perfectionnés) or for versions récentes (or perfectionnées); Never évolué(e)s, that would be poor marketing
Bono Local time: 11:33 Native speaker of: French, English PRO pts in pair: 235