context: Twice during his time at this school Constantin won a prize as the best mathematics student in Belgium.
source: At this stage Carathéodory began training as a military engineer.
reference_original: Zu dieser Zeit begann Carathéodory mit seiner Ausbildung zum Militäringenieur.
reference_flipped: Zu dieser Zeit begann Carathéodory mit ihrer Ausbildung zur Militäringenieurin.