Ключевые слова: adult, analysis, bacillus, background, bacteria, biochemistry, biology, chemical, cholera, closeup, copy, day, eco, ecology, environment, environmental, experiment, glass, gloves, hand, health, holding, industry, laboratory, lake, liquid, male, man, medicine, microbiology, mineral, natural, nature, outdoors, pharmacy, pollution, professional, research, river, safety, sample, science, scientist, space, taking, test, text, tube, water, worker,