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今年5月,美国环保部将公众认为过高而批评已久的饮用水铅危险含量降为原先的1/10,即10亿分之5.但该部将允许多自来水公司在一、二十年内达到此标准.
In May of this year, the U.S. Department of Environmental Protection reduced the dangerous level of lead in drinking water that the public thought was too high and had been criticized to 1/10, that is, 5 parts per billion. But the ministry will allow more than one Reach this standard during the year.