Ключевые слова: analysis, analyzing, bacteria, biology, biotechnology, bottle, chemical, chemist, chemistry, contaminated, contamination, ecology, environment, environmental, equipment, examine, experiment, gloves, health, ice, lake, man, measurement, measuring, nature, outdoors, person, pollution, professional, protection, protective, research, river, sample, science, scientific, scientist, snow, study, substance, technician, technology, test, toxic, tube, waste, water, winter,