The Chinese word "主任" is formed through the semantic combination of two characters: "主", which conveys the idea of being primary, master, or in charge, and "任", which signifies duty, responsibility, or appointment. Together, they create a compound word where "主" modifies "任" to indicate a position or role characterized by leading responsibilities, essentially referring to a person who holds a chief office, such as a director or head, entrusted with overarching duties in an organization or department.