Compounds may undergo concentrations.Logical formLearned from99 sentences. Pollutants may undergo concentrations.Logical formLearned from99 sentences. Species may undergo concentrations.Logical formLearned from98 sentences. Dust may undergo concentration.Logical formLearned from98 sentences. Gases may undergo concentration.Logical formLearned from98 sentences. Concentrations can be hazardous.Logical formLearned from97 sentences. Contaminants may undergo concentration.Logical formLearned from97 sentences. Concentrations can be known.Logical formLearned from97 sentences. Political power may undergo concentration.Logical formLearned from97 sentences. Persons may lose concentration.Logical formLearned from97 sentences. Powers can be constituted-of-or-filled-with concentration.Logical formLearned from97 sentences. Concentrations can be environmental.Logical formLearned from96 sentences. Mercury may undergo concentration.Logical formLearned from96 sentences. Industries may undergo concentration.Logical formLearned from95 sentences. Salt may undergo concentrations.Logical formLearned from95 sentences.