An increasing number of people come to realize that the disappearance of animals will result in serious threat to the equilibrium of ecosystem.

越来越多的人们开始认识到动物的消失会对生态系统的均衡产生严重的威胁。

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Then, we point out a procedure which modern ecology research should obey, and discuss the four basic characteristics of ecosystem in detail: level, opening, nonlinear and far-from-equilibrium.

比较详细地论述了生态系统的四个基本特征：层次性、开放性、非线性与远离平衡；

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