Ключевые слова: adult, analysis, chemical, chemical experiment, clinical, closeup, development, diagnostic, discovery, doctor, epidemic, equipment, experiment, glass, glove, hand, healthcare, laboratory, liquid, microbiology, one, pandemic, people, person, pharmaceutical, pharmaceutical testing, pouring, protective, reaction, red, research, rubber, scientific, solution, study, substances, technician, testing, transparent, tube, unrecognizable, vaccine, virus,