The rivers feed into the Bering Sea and Gulf of Alaska — cold, nutrient-rich waters which support tens of millions of seabirds, and over 400 species of fish, shellfish, crustaceans, and mollusks.

这些河流汇入白令海和阿拉斯加湾这片寒冷而又营养丰富的水域，在这片水域里生活着数千万只海鸟、400多种鱼类、贝类、甲壳类和软体动物。

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When nutrients are used over and over in the environment, we call that a nutrient cycle.

当营养物质在环境中被反复使用时，我们称之为营养循环。

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Half of those over 75 in hospital are reckoned to be nutrient-deficient, as are many obese people.

在75岁以上的住院老人中，半数人被认为是营养缺乏，这一数量和肥胖的人数相当。

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The cost to countries of nutrient over-enrichment from the degradation of their marine and coastal natural resource base, and the services and livelihoods it provides, will increase without improved policy responses.

UNESCO: Intergovernmental Oceanographic Commission