(1)川と湖の水の汚染
(2)pollution of the water in rivers and lakes
さらに詳しく
(1)水、大気、または土壌を汚染する廃棄物
(2)汚染を引き起こす物質
(3)waste matter that contaminates the water or air or soil
(4)a substance that contaminates
(1)汚染物質の除去
(2)the removal of contaminants
