In 1931, Du Chengrong was sent by the Chinese government to Vienna, Austria, for police officer training. Austria's high reputation in police management and technical training attracted him to pursue this opportunity. Upon arrival, Du was placed in a rigorous training program where he met Wagner's father, a strict and meticulous instructor. Wagner's father taught Du how to stay calm in emergencies and make decisions under pressure. Due to his excellent performance, Du quickly earned Wagner's father's respect, and they formed a close bond.

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发布于：天津市