Ключевые слова: advice, background, bacteria, closeup, cold, concept, conceptual, confused, confusion, contagious, desk, disease, doubt, epidemic, fever, flu, hardwood, health, icon, illness, indoors, infection, influenza, life, mark, medical, nobody, plank, problem, question, rough, sick, sickness, sign, solution, stethoscope, still, symbol, table, textured, timber, viral, white, wood, wooden,