大自然厌恶任何生物独占世界的现象,从简单的原生动物到人类无一例外。所以,地球上的生物都不肯单独生存,有时也真的不能单独生存。大自然中的生物之间,不仅存在着环环相扣的食物链,而且还存在着相互依存,彼此互利,缺此失彼都不能生存的共生现象。 Nature loathes the phenomenon of any creature monopolizing the world, from simple protozoa to human beings. Therefore, all creatures on Earth will not survive alone and sometimes can not really live alone. There is not only interlinked food chains among the living things in nature, but also the intergrowth of interdependence, mutual benefit and lack of survival.