2. In 1980, the American Nursing Association defined nursing as: "Nursing is to diagnose and deal with human responses to existing or potential health problems." According to this definition, modern nursing is a science that studies how to diagnose and deal with human responses to existing or potential health problems. Emphasis on "people's behavioral response" is manifested in people's behavioral response to a thing from physiological, psychological, social, cultural and spiritual aspects. For example, the behavioral response of patients with myocardial infarction can be manifested as: physiological-pain, chest tightness, shortness of breath; Psychology-fear, fear; Socialization-the care of relatives; Cultural knowledge and understanding of disease knowledge; Mentally-is it valued and respected by nurses and doctors?