/ɒn ˈdjuːti ˈpɒlɪsmən/ – Phrase
Definition: cảnh sát trực ban, cảnh sát đang thi hành công vụ.
A more throughout explanation: An “on-duty policeman” refers to a law enforcement officer who is currently engaged in performing their official duties and responsibilities as a member of a police force or agency. This term specifically denotes that the officer is actively working and available to respond to incidents, enforce laws, maintain public order, and provide assistance as required during their assigned shift or period of duty.
Example: The on-duty policeman responded to the emergency call and arrived at the scene within minutes.