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。
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)。
Talk of “ecosystem services” now draws attention to the helpful things that nature does unbidden, such as providing fresh soil and clean water.
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。
The Poyang lake is the largest fresh water lake in China. It is one of the districts which have very rich biological resources in wetland ecosystem.
鄱阳湖是我国最大的淡水湖泊，是我国湿地生态系统中生物资源最丰富的地区之一。
A reservoir is built in housetop, have structure of wall of edaphic lay aside, some of alga, fish is put inside, form small-sized ecosystem with assuring water quality fresh.
在屋顶建设一个蓄水池，有土壤贮壁结构，里面放些藻类、鱼类，形成小型生态系统以保证水质的新鲜。
A reservoir is built in housetop, have structure of wall of edaphic lay aside, some of alga, fish is put inside, form small-sized ecosystem with assuring water quality fresh.
在屋顶建设一个蓄水池，有土壤贮壁结构，里面放些藻类、鱼类，形成小型生态系统以保证水质的新鲜。
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