Non-native species can appear harmless for decades, then turn invasive.

非本地物种可能会在几十年内看起来无害，继而变得有入侵性。

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What is more, non-native species can appear harmless for decades, then turn invasive.

更重要的是，非本地物种可能会在几十年内看起来无害，然后变得有入侵性。

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"Invasive alien species are non native species which are accidentally or intentionally introduced into new areas. They range from microbes to mammals," Dr MacKinnon says.

麦克·金南博士说，“侵入性外来物种是偶然或故意被引入新地区的非本土物种，其范围涉及从微生物到哺乳动物的多个物种。”

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In fact, according to the New York State Biodiversity Research Institute, that man-caused influence comes in fifth behind habitat degradation and loss, non-native invasive species, pollution, and overuse of resources.

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