因此，恢复以水生植物为丰的水生生态系统足重建富营养湖泊生态系统和控制湖泊内源负荷的重要措施。

So, reestablishment of floating macrophytes was also a significant method to reconstruct the eutrophic lake ecosystem and control inner loading release.

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凡此种种都归结为：生态系统和成本控制。

That's what it all boils down to: ecosystems and control.

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从控制论的角度看，象蝌蚪这样的有机体和淡水沼泽这样的生态系统之间控制方式的不同在于，单个有机体受到严格紧密的束缚，而生态系统则宽松自由，不受束缚。

The cybernetic difference between an organism such as a pollywog and an ecosystem such as a fresh-water bog is that an organism is tightly bound, and strict; an ecosystem is loosely bound, and lax.

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