Depuis son enfance, il a l’obsession de devenir médecin.
Since childhood, he has had an obsession with becoming a doctor.

Elle a l’obsession de la propreté et nettoie sa maison tous les jours.
She has an obsession with cleanliness and cleans her house every day.

Il a l’obsession de réussir et travaille sans relâche pour atteindre ses objectifs.
He has an obsession with success and works tirelessly to achieve his goals.

Cette personne a l’obsession de contrôler tous les détails de sa vie.
This person has an obsession with controlling every detail of their life.

Depuis qu’il a découvert la musique, il a l’obsession de jouer de la guitare.
Since he discovered music, he has had an obsession with playing the guitar.