The word 急诊室 is formed by logically combining three distinct concepts. It starts with 急 (urgent), modifies it with 诊 (diagnosis/treatment) to specify "emergency medical treatment", and finally attaches 室 (room) to designate the physical location where this specific function occurs. The construction visually progresses from the condition (urgency), to the action (medical care), to the place (the room), creating a complete and intuitive picture of an "emergency room".