Ключевые слова: analysis, analyzing, biochemistry, biotechnology, bottle, bottled, chemical, chemist, chemistry, clean, confused, contaminated, contamination, control, discovery, doctor, drink, examining, experiment, expertise, filtered, fresh, healthcare, lab, laboratory, liquid, man, medical, medicine, microbiology, microscope, pollutant, pollution, puzzled, quality, research, researcher, sample, scared, scientific, scientist, student, studying, substance, surprised, test, testing, toxic, virus, water,