Ключевые слова: adult, analysis, bacillus, background, bacteria, biochemistry, biology, chemical, cholera, closeup, copy, day, environment, female, glass, glove, hand, holding, industry, laboratory, lake, liquid, medicine, microbiology, mineral, nature, outdoors, pharmacy, pink, pollution, pond, research, river, salination, salinization, salt, sample, saturate, science, space, taking, test, text, tube, waste, water, woman, work, worker,