Several decades ago, Americans dumped raw sewage into rivers and many industrial plants are now still dumping chemical pollutants into lakes, rivers and oceans.

 
  • ??几十年前,美国人把经处理的污物、污水倾倒入江河,许多工厂如今仍在把化学污染物倒入湖泊、江河和海洋。
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