One of the memories of many people watching Hong Kong films and dramas is that the police officers in the films said "yes, sir" or "thank you, sir" to their superiors. However, with the Hong Kong Police Force starting from July 1, it will fully adopt "Chinese Walking Exercise", and all passwords and answers will be changed to Mandarin and Cantonese, which will also go into history.

In addition, the tone of this sentence is also very humorous.

As a friend who grew up watching Hong Kong films, Teacher Si is familiar with such classic Hong Kong films as Infernal Affairs, Never Say Never, and Dark War. "Mr. Ye", a symbolic dialogue that appears many times in Hong Kong films, runs through our childhood and youth.