Discharges of toxic chemicals, heavy metals, and other hazardous substances can impair aquatic life and render both the receiving waters (even after treatment) and fish and shellfish therefrom unsafe for human consumption.

• 往水中排放有毒化学物品、重金属和其他危险的物质能损害水生动物，破坏水质（即使净化以后），使得人们食用鱼类和贝壳类动物时就有了一定的危险。