By this theory, human activity is aggravating the arsenic problem. 根據這個理論，人類活動惡化了砷污染問題。
The results showed that there was arsenic pollution in soil around the piggery in which roxarsone has been med for a long period. 結果表明，長期使用洛克沙砷的養豬場周圍的土壤及用飼餵過洛克沙砷的豬類作肥料的土壤都存在砷污染。
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