Ключевые слова: analysis, bacillus, bacteria tests, bad, biological, blue, chemical, cholera, close, concept, danger, discharge, distribution, ecology, emissions, environment, epidemics, gloves, hand, health, impurities, infection, liquid, material, measurement, mens, nature, plague, pollution, quality, radiation, sample, sea, state, study, substance, test, the environment, tube, waste, water,