Ключевые слова: aid, b12, background, black, blood, book, business, cardiac, cardiology, care, chemical, chemistry, clinic, clinical, colorful, concept, cure, design, diagnosis, doctor, equipment, expertise, health, healthcare, healthy, inject, instrument, laboratory, mask, medic, medical, medicine, patient, pharmacy, physician, professional, pulse, research, sample, stethoscope, symbol, syringe, table, test, text, tool, treatment, view, vitamin, workplace,