Emergency: emergency treatment and rescue. It means emergency treatment. Its existence ensures that we can get professional and scientific treatment in the fastest time when sudden diseases and accidental injuries occur. The severity of emergency patients' illness determines the priority of treatment and disposal. The grading of emergency patients' condition is not only to rank patients, but also to divert patients, so that patients can get correct diagnosis and treatment at the right time and in the right area.

Outpatient service: the act of a doctor treating a patient in a hospital or clinic, giving initial diagnosis and medication without hospitalization, or accepting hospitalization. Outpatients usually receive patients with mild symptoms and get a preliminary diagnosis after a set of diagnostic procedures and auxiliary examinations by outpatient doctors. If outpatient doctors can treat patients symptomatically, they will treat them. If the outpatient doctors have doubts about the patient's condition or diagnose it as serious and urgent, they will be sent to the inpatient ward for further examination or surgery and treatment in the hospital. In a broad sense, outpatient service also includes emergency treatment. The classification of outpatient service can be divided into general outpatient service, health care outpatient service and emergency outpatient service according to the patient's condition, urgency and health status.