求翻译：由人类活动而引进的外来种如果能够适应新环境的条件，就能建立起自己的种群。其中许多种类可以通过多种方式有效地扩大自己的种群，同时抑制或消灭当地原生物种。外来物种可以与本地种竞争有限的资源，或者捕食本地物种，或者带入病原体，或者通过自己的活动改变生境使本地物种无法生存。对于岛屿和与外界隔离时间较长的生境中的物种来说，外来种的引入常常是灾难性的。是什么意思？

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Human activities and introduced by the Foreign if you are able to adapt to new environmental conditions, will be able to set up their own stocks. Many of these types can be done in a number of ways of effectively expanded the range of its stocks, but also to neutralize or destroy the indigenous spec

By human activities and the introduction of alien species to adapt to new environmental conditions, will be able to set up their own stocks. Many species can effectively expand their populations in several ways, at the same time restrain and kill local native species. Alien species can compete with

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