Ключевые слова: aid, air, asthma, background, bottle, breath, breathe, breathing, care, clinic, clinical, closeup, control, covid19, disease, emergency, equipment, first, flow, flowmeter, gas, gauge, health, health care, healthy, hospital, hospital room, instrument, laboratory, life, medicals, medicine, nobody, o2, object, oxygen, paramedic, pneumonia, pressure, regulator, respiratory, room, science, supply, system, tank, therapy, treatment, ward,