Translate the following English sentence to French:
"For example, it is acknowledged on page 15 of the explanatory statement that "the different levels of development and traditions in the field of social security in the Member States make it impossible to bring about uniform harmonisation of the Member States' social security systems" ."
La notion de "véritable harmonisation" est une de ces expressions confuses, qui voile totalement le processus d'intégration dont il est question.