Ключевые слова: background, biology, blue, care, closeup, concepts, crisis, dangerous, dirty, discarded, disposable, doctor, ecology, environment, epidemic, face, face mask, garbage, health, hygiene, infection, mask, masks, medical mask, medicine, no people, object, old, outdoor, pandemic, patient, pollution, prevention, protect, protection, protective, risk, selective focus, street, surgery, trash, used, virus, waste, white, world,