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.

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。

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Human health ultimately depends upon ecosystem products and services (such as availability of fresh water, food and fuel sources) which are requisite for good human health and productive livelihoods.

人类健康最终仍取决于保证人类良好健康和富有生产活力的生计所必要的生态系统产品和服务(如淡水、食物和燃料来源的可及性)。

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Fresh rainfall may prove more helpful to winter-sown crops such as wheat, which rely heavily on water from reservoirs, whose levels remain far below average.

新增加的雨水对于冬天那些主要依靠水库(其水量已经严重低于平均蓄水线)蓄水量的庄稼，如小麦来说，或许会有很大帮助。

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The new process has obvious appeal in coastal areas where fresh water is scarce such as the Persian Gulf.

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The refined cocktails incorporate traditional spirits, fresh-squeezed juices and aromatics, such as rose water, to stimulate your sense of smell.

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The research looked specifically at production farms using open, outdoor fresh water ponds applying current technology, and considered such factors as suitable land use, topographical features, weather patterns and sky conditions available in the contiguous U.S. states.

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