这样的养殖场还不能让切萨皮克湾完全回到以前的原生态，但是科学家表示，牡蛎在净化所生长区域海水上还是绝对有效的。
Such farming won't make the bay pristine again, but the researchers say the oysters are effective at cleaning the area where they're grown.
对于“生态系统服务”的谈论让人们注意到有益的事情——无论是提供原油还是净化水域，自然并非自愿为人类提供服务。
Talk of “ecosystem services” now draws attention to the helpful things that nature does unbidden, such as providing fresh soil and clean water.
生态系统的自我净化能力也会引起连锁反应。
The ability of some ecosystems to clean themselves up can also cause knock-on problems.
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