Ключевые слова: analysis, bacillus, bacteria, biological, bottle, bucket, chemical, cholera, clarity, close, concept, container, cup, danger, doctor, ecology, environment, environmental, equipment, experiment, flask, glove, hand, harm, health, kitchen, laboratory, lake, land, medical, nature, outdoor, person, pollution, production, protection, research, researcher, resources, river, sample, sampling, science, scientific, study, substance, technology, test, water, worker,