就是那年，大坝的门户错误的打开，使得那些原本位于河流底部的有毒重金属层浮到了表面，她继续说道。
In that year "a defect at the dam opened the gates, making a toxic layer of hard metals deposited at the bottom of the river come up" to the surface, she said.
虽说锡层脱落时这口锅还是能用的，但你必须保证每次在烧菜前用力擦洗锅子，而且菜一烧好就得马上出锅，因为烧好的菜可能会跟锡层已经脱落的铜锅发生有毒的化学反应，所以最好还是及时地重镀锡层。
If cooked food remains in a poorly lined pot, some kind of a toxic chemical reaction can take place. It is thus best to have the pot re-tinned promptly.
海面上的赤潮对水里的动物和游泳的人来说都是有毒性的，赤潮藻还会在海面上留下一层难看的绿色浮渣，不但污染了供人旅游的海岸，还遮挡了海草的光线，使其不能生长。
The algal blooms, which can be toxic to animals and human swimmers, leave behind an ugly layer of green scum that fouls tourist beaches and starves seaweeds of light.
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