Across the American continents, exotic species are those introduced after the first European contact.
在美洲大陆上，外来物种是在第一次接触欧洲后引进的。
Indeed, most species that get introduced don't have much effect at all.
实际上大部分引入物种(对生态环境)一点(消极)影响也没有。
The botanist introduced a new species of plant to the region.
那位植物学家向该地区引入了一种新植物。
Some other applications of ornamental tree species were also introduced.
文中还介绍了观赏树木其它方面的用途。
Recently this alien invasive species has been introduced in China and threatened the agricultural production.
近年来该害虫传入我国，对农业生产构成严峻威胁。
Recently this alien invasive species has been introduced in China and threatened the agricultural production.
近年来该害虫传入我国，对农业生产构成严峻威胁。
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