Ключевые слова: adult, analysis, assistant, caucasian, caution, cautious, chemical, chemicals, chemist, chemistry, closeup, coat, danger, dangerous, experiment, experiments, eyewear, female, glasses, hold, holding, lab, laboratory, look, looking, mask, medical, one, people, person, professional, reaction, research, researcher, safety, science, scientific, scientist, scientists, technician, test, testing, tests, toxic, tube, vial, woman, women, work, working,