un numéro de dossier : a case number, a reference number
un dossier (sur un ordinateur) : a folder (on a computer)
un dossier (sur un client) : a file, a dossier (about a client)
- "Votre numéro de dossier : 9531208547"
- "Votre numéro de dossier : 5920197"
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