It is a land of natural ecosystems into artificial ecosystem process, is also a natural, economic, and social factors at the complex process.

它既是一个把土地的自然生态系统变为人工生态系统的过程，也是一个自然、经济、社会诸因素综合作用的复杂过程。

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Actually, there are many large complex networks in natural and real systems, such as ecosystem, social system, Internet, WWW, energy networks, transport networks, etc.

事实上，在许多自然和实际系统中都存在着大规模的复杂网络。如生态系统、社会系统、互联网、万维网、能源网和运输网等等。

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The article studied the influence of ducks in a rice-duck complex ecosystem as well as its natural enemies and diseases, insects, weeds and pests.

研究鸭子在稻鸭复合生态系统中对蜘蛛及病、虫、草害的影响。

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