Ключевые слова: 3034 years, above 30, accuracy, authority, beijing, care, china, chinese ethnicity, color image, concentration, confidence, doctor, expertise, head and shoulders, healthcare and medicine, healthcare worker, horizontal, hospital, human body part, human hand, illuminated, indoor, looking away, low angle view, mask, medical equipment, medical procedure, mid adult men, obscured face, one person, operating gown, operating room, photography, professional occupation, protection, protective workwear, responsibility, scrubs, skill, standing, surgeon, surgery, surgical cap, surgical equipment, surgical glove, surgical light, surgical mask, working,