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多少万年的进化使自然界万物连为一体,相互依存相互制约,维持了一个物种平衡的生态环境。高山、大海和沙漠过去曾是阻止物种扩散的天然屏障,然而,随着人类活动的加剧,越来越多的物种离开了它的原生地。由于不再受原环境,特别是天敌的制约,它们便疯狂地生长、繁殖,造成了严重的生态灾难。
How many thousands of years of evolution have brought together all things in the natural world, interdependence and mutual restraint, and maintaining a balanced ecological environment for species. Mountains, seas and deserts used to be natural barriers to the spread of species. However, as human activities have intensified, more and more species have left their original habitat. Since they are no longer constrained by the original environment, especially natural enemies, they grow wildly and reproduce, causing serious ecological disasters.