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我们生活的地球是一个纷繁复杂的生态系统,各种各样的生命以各自不同的形式存在着,它们互相竞争又互相依赖,在漫长的生命演化过程中形成了极其精巧的生物圈。在这里大约有500万～3000万种生物,已经命名的约有180万种,我们人类不过是其中的一种。如果把这个不断变化的生态系统比作网的话,人类只是网络的一个节点,而各种生命则共同支撑着这张网,相依相存,协同共进。
The earth we live in is a complicated ecosystem. All kinds of life exist in different forms. They compete with each other and depend on each other. They form an extremely delicate biosphere during the long evolution of life. There are about 5 million to 30 million species here, about 1.8 million have been named, and we humans are but one of them. If we compare this ever-changing ecosystem to a network, humans are just nodes in the network, and all kinds of life support this network together, co-exist and work together.