以下为句子列表：
英文: Over the past 30 years, the U.S. has substantially reduced industrial and chemical pollution from point sources (i.e., a clearly identifiable source, such as a discharge pipe or conduit).
中文: 描述:在过去的30多年来，美国显著地降低了工业和化学的点源污染，点源即可清楚确定的源头，如排水管道等。
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