Ключевые слова: background, black, blue, cardiac, cardiologist, care, clean, cure, desk, device, diagnosis, disease, doctor, emergency, equipment, examination, frequency, glass, health, healthy, hear, heart, heartbeat, hospital, illness, instrument, listen, measurement, medic, medical, medical background, medicine, metal, nurse, physician, reflection, reflective, rubber, science, sick, sound, stethoscope, surgeon, table, test, therapy, tool, treatment, white, work,