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人们曾提议用化学和生物学机理来解释如何把六价铬(一种有毒的工业废弃物)转化成不太危险的三价铬。现在,美国洛伦斯伯克利国家实验室的科学家利用
Chemical and biological mechanisms have been proposed to explain how hexavalent chromium (a toxic industrial waste) can be converted into less dangerous trivalent chromium. Now scientists at the Berkeley National Laboratory in the United States use it