If you put additional nitrogen into a water system, you change the type and quantity of life that water can support.

如果你在一个水系统中多放氮，那么你就会改变它的形态，并且导致靠水供给的生命数量有所改变。

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“If you cut down more trees than you grow, you run out of trees,” writes Gilding.“If you put additional nitrogen into a water system, you change the type and quantity of life that water can support.

“如果你砍倒的树比你种的还多，你就会将树用光，”基尔丁写道，“如果你将额外的氮投放进一个水系，你就会改变那个水体所能维持生命的种类和数量。

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Excessive nitrogen in the water system contributes to the "dead zone" found at the mouth of the Mississippi and other rivers.

水系中的过量氮是造成密西西比河与其他河流河口处“死亡区”的元凶。

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