pollution of herbicide

例句：

1. 1. The factory's emissions have caused serious pollution in the nearby river.
   这家工厂的排放物在附近的河流造成了严重的污染。
2. 2.The government is working to reduce pollution in the city.
   政府正在努力减少城市的污染。
3. 3. The pollution of the ocean has been a major concern for scientists and environmentalists.
   海洋污染一直是科学家和环保人士关注的主要问题。